| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 327308000 | Variable attenuator | 43 |
| 20080204107 | MOS RESISTANCE CONTROLLING DEVICE AND MOS ATTENUATOR - A MOS resistance controlling device includes: a plurality of MOS transistors having a first MOS transistor to N-th (the integer N is larger than 1) MOS transistor being serially connected, the source of the first MOS transistor being set to a first reference potential, the drain the N-th MOS transistor being set to a second reference potential, and the drain of an I-th MOS transistor being connected to the source of an I+1-th MOS transistor, where I is an integer from 1 to N−1; a current source which is electrically disposed at connection node between the drain of the N-th MOS transistors and the second reference potential; and an operational amplifier having a first input terminal being supplied with a third reference potential, a second input terminal connected with the connection node and an output terminal being connected with gates of the MOS transistors. | 08-28-2008 |
| 20080204108 | DE-EMPHASIS SYSTEM AND METHOD FOR COUPLING DIGITAL SIGNALS THROUGH CAPACITIVELY LOADED LINES - A system for de-emphasizing digital signals, such as address signals, boosts the level of the signals for one clock period prior to transmitting the signals through signal lines that may have a relatively large capacitance. The system may include a delay circuit that delays the digital signal for a period corresponding to one period of a clock signal. The system may also include a first multiplier circuit that generates a first intermediate signal by multiplying the first and second logic levels of the digital signal by a first multiplier. Similarly, a second multiplier circuit generates a second intermediate signal by multiplying the first and second logic levels of the delayed signal from the delay circuit by a second multiplier. A combining circuit then subtracts the second intermediate signal from the first intermediate signal, and the resulting signal is level-adjusted to generate the de-emphasized signal. | 08-28-2008 |
| 20090066394 | PEAKING CONTROL CIRCUIT - There are provided a peaking detection part detecting a peaking amount in an output part of an inductor peaking circuit and a control signal generation part varying a circuit parameter of the inductor peaking circuit based on the peaking amount detected by the peaking detection part. Particularly, the inductor peaking circuit has inductors and resistors inserted in series between the output part and a power supply, and capacitances coupled in parallel between the output part and an earth (GND), and depending on respective values of these inductors, resistors and capacitances, it is possible to suppress a peaking generated in the output part. | 03-12-2009 |
| 20090079489 | CONSTANT PHASE DIGITAL ATTENUATOR WITH ON-CHIP MATCHING CIRCUITRY - Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit comprises an input node to receive an input signal to be attenuated, an output node to output an attenuated signal, a reference loss path between the input node and the output node, and an attenuation path between the input node and the output node. The reference loss path comprises switching elements and matching circuitry to improve Voltage Standing Wave Ratio (VSWR), and the attenuation path comprises switching elements and attenuating circuitry to attenuate the input signal when the digital attenuator circuit is switched from a reference loss state to an attenuation state. An effective phase length of the reference loss path and an effective phase length of the attenuation path may be equalized to provide a constant phase when the digital attenuator circuit is switched between states. Other embodiments are described and claimed. | 03-26-2009 |
| 20090134928 | Attenuator - In the existing technique in which the attenuation characteristic of an attenuator is adjusted by a voltage value, there are problems that a scale of a circuit of the attenuator increases because a new circuit for supplying voltage such as a step-down circuit becomes necessary, and that a thermal noise and a shot noise are mixed in an output signal of the attenuator. To solve the above-mentioned problems, provided is an attenuator comprising a T-type two terminal pair network including first and second circuits connected in series, and a third circuit connected in shunt between these first and second circuits. A shunt capacitor is connected between the first and second circuits independent from the third circuit. | 05-28-2009 |
| 20090153216 | IO DRIVER CIRCUIT WITH OUTPUT STAGE CONFIGURABLE AS A THEVENIN TERMINATOR - An IO driver circuit incorporates an output stage control circuit that selectively configures an output stage for the IO driver circuit to operate as a thevenin termination whenever the IO driver circuit is receiving a signal from an input/output node to which the IO driver circuit is coupled. The output stage may include a plurality of branches, with each branch having a pull-up device and a pull-down device, and the output stage control circuit selectively activates the pull-up devices in a first subset of branches in the output stage while concurrently activating the pull-down devices in a second subset of branches, as well as while leaving the pull-up devices in the second subset of branches and the pull-down devices in the first subset of branches deactivated. | 06-18-2009 |
| 20090167403 | AGC method using digital gain control - An attenuator system includes a first adjustable impedance component on a first current path between a input component and a output component, and a second adjustable impedance component between the first current path and ground, wherein each of the first and second adjustable impedance components include a plurality of selectable, discrete legs, each leg having an impedance. | 07-02-2009 |
| 20090184745 | DE-EMPHASIS SYSTEM AND METHOD FOR COUPLING DIGITAL SIGNALS THROUGH CAPACITIVELY LOADED LINES - A system for de-emphasizing digital signals, such as address signals, boosts the level of the signals for one clock period prior to transmitting the signals through signal lines that may have a relatively large capacitance. The system may include a delay circuit that delays the digital signal for a period corresponding to one period of a clock signal. The system may also include a first multiplier circuit that generates a first intermediate signal by multiplying the first and second logic levels of the digital signal by a first multiplier. Similarly, a second multiplier circuit generates a second intermediate signal by multiplying the first and second logic levels of the delayed signal from the delay circuit by a second multiplier. A combining circuit then subtracts the second intermediate signal from the first intermediate signal, and the resulting signal is level-adjusted to generate the de-emphasized signal. | 07-23-2009 |
| 20100066427 | STEPPED DELAY CONTROL OF INTEGRATED SWITCHES - An integrated switching device, such as an RF attenuator, can be controlled to be in various states according to control bits of a control signal. The integrated switching device can be gradually transitioned from one state to another by staggering the timing of changing the control bits. Latch-up problems in the integrated switching device can thereby be reduced or prevented. | 03-18-2010 |
| 20100148845 | LIMITER AND SEMICONDUCTOR DEVICE USING THE SAME - The limiter of the invention uses as a diode a stacked gate thin film transistor (TFT) including a floating gate. When the TFT including a floating gate is used, the threshold voltage Vth may be corrected by controlling the amount of charge accumulated in the floating gate even in the case where there are variations in the threshold voltages Vth of the TFT. | 06-17-2010 |
| 20100171541 | CONSTANT PHASE DIGITAL ATTENUATOR WITH ON-CHIP MATCHING CIRCUITRY - Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit ( | 07-08-2010 |
| 20100219872 | Semiconductor device - A semiconductor device, having a test circuit of a multivalued logic circuit without newly provision of an output terminal for a test signal, and with no increase in transmission delay in an output signal, includes an n-valued input terminal, and comparators that operate at different threshold voltages in response to input signals which have been input to the n-valued input terminal, respectively, and also includes an impedance control circuit that is connected to the n-valued input terminal and outputs of the comparators, respectively, and changes a combine resistance value in response to the output signals of the comparators to change a current flowing in the n-valued input terminal. | 09-02-2010 |
| 20100295594 | Source Follower Attenuator - The present invention discloses a source follower attenuator circuit comprising a current source; an input transistor with a source connected to the current source and a drain connected to ground; a control transistor with a source connected to the current source and a drain connected to ground; wherein an attenuated output signal across the source and drain of the control transistor is controlled by transconductances, in an on-state, of the input transistor and of the control transistor respectively. | 11-25-2010 |
| 20110025396 | Digital Attenuator Circuits and Methods for Use thereof - An attenuator system includes a first adjustable impedance component on a first current path between a input component and a output component, and a second adjustable impedance component between the first current path and ground, wherein each of the first and second adjustable impedance components include a plurality of selectable, discrete legs, each leg having an impedance. | 02-03-2011 |
| 20110102050 | Attenuator - An attenuator includes a T-type two terminal pair network including first and second terminals, first, second and third circuits, wherein the first terminal receives an input signal to be attenuated, wherein the first circuit is connected between the first and second terminals, wherein the second circuit is connected between the first circuit and the second terminal and is connected to the first circuit via a node, wherein the third circuit is connected to the node, and a capacitor connected to the node, wherein the capacitance value of the capacitor is variable. | 05-05-2011 |
| 20110140755 | DIGITAL ATTENUATOR HAVING SMALL PHASE VARIATION - Disclosed herein is a digital attenuator, which can improve the variation in the pass phase of the digital attenuator because the difference between parasitic components caused by the turn-on and turn-off operations of the switching transistors of the digital attenuator causes the difference between the pass phases. The digital attenuator of the present invention includes an attenuation circuit unit configured to cause a variation in a pass phase due to a difference between parasitic components caused by turn-on and turn-off operations of switching transistors, and a phase correction unit connected in parallel with the attenuation circuit unit and provided with a series resistor and a low pass filter. Accordingly, variations in pass phase can be eliminated by connecting a low pass filter, connected to series resistors, in parallel with the series switch of an attenuation circuit unit, thus eliminating the influence of the parasitic components. | 06-16-2011 |
| 20110148501 | VARIABLE ATTENUATOR HAVING STACKED TRANSISTORS - In one embodiment, a variable attenuator is disclosed having an attenuation circuit and a control circuit. The attenuation circuit may include a first series connected attenuation circuit segment and a shunt connected attenuation circuit segment, as well as additional attenuation circuit segments. Each attenuation circuit segment includes a stack of transistors that are coupled to provide the attenuation circuit segment with a variable impedance level having a continuous impedance range. In this manner, the control circuit may be operably associated with the stack of transistors in each attenuation circuit segment to control the variable attenuation level of the variable attenuator. | 06-23-2011 |
| 20110148502 | TEMPERATURE COMPENSATION ATTENUATOR - In one embodiment, a temperature compensating attenuator is disclosed having an attenuation circuit and a control circuit. The temperature compensating attenuator circuit may include a first series connected attenuation circuit segment and a shunt connected attenuation circuit segment, as well as additional attenuation circuit segments. Each attenuation circuit segment includes a stack of transistors that are coupled to provide the attenuation circuit segment with an impedance attenuation level having a continuous impedance range. The control circuit may be operably associated with the stack of transistors in each attenuation circuit segment to control the attenuation level of the attenuation circuit. The temperature compensating attenuator includes a temperature compensating circuit that compensates for variations in operation of the attenuation circuit due to a temperature change. | 06-23-2011 |
| 20110148503 | TEMPERATURE CONTROLLED ATTENUATOR - In one embodiment, a temperature controlled attenuator is disclosed having an attenuation circuit and a control circuit. The attenuation circuit may include a first series connected attenuation circuit segment and a shunt connected attenuation circuit segment, as well as additional attenuation circuit segments. Each attenuation circuit segment includes a stack of transistors that are coupled to provide the attenuation circuit segment with a variable impedance level having a continuous impedance range. Furthermore, the temperature controlled attenuator includes a temperature controlled circuit that adjusts the attenuation level of the attenuation circuit in accordance to an operating temperature. In this manner, the attenuation level of the temperature controlled attenuator is temperature dependent. | 06-23-2011 |
| 20110254609 | VECTOR MODULATOR HAVING ATTENUATORS WITH CONTINUOUS INPUT STEERING - Variable attenuation systems having continuous input steering may be used to implement vector or quadrature modulators and vector multipliers. Discrete implementations of attenuators with continuous input steering may have two outputs which may be cross-connected to provide four-quadrant operation. A symmetrically driven center tap may provide improved zero-point accuracy. | 10-20-2011 |
| 20110273217 | VOLTAGE GENERATING CIRCUIT FOR AN ATTENUATOR - A circuit includes a digital-to-analog converter (DAC), coupled to a power supply, that provides a first current at a first output terminal of the DAC and a second current at a second output terminal of the DAC, the first current being differential to the second current; a first circuit, coupled to the first output terminal of the DAC and to the second output terminal of the DAC, that generates a first voltage and a second voltage, the first voltage being non-linear with respect to the first current and the second voltage being non-linear with respect to the second current; and an attenuator coupled to the first circuit, and responsive to the first voltage and the second voltage to attenuate an input signal of the attenuator and to generate linear attenuation characteristics in decibels with respect to the first current and the second current. | 11-10-2011 |
| 20110304376 | SEMICONDUCTOR INTEGRATED CIRCUIT INCLUDING VARIABLE RESISTOR CIRCUIT - Provided is a semiconductor integrated circuit including a variable resistor circuit of the small layout area, which is free from an error in resistance caused by ON-state resistances of switch elements for trimming, and is also free from power supply voltage dependence and temperature dependence. The semiconductor integrated circuit including a variable resistor circuit includes: a resistor circuit including a plurality of series-connected resistors; a selection circuit including a plurality of switch elements for selecting a connected number of the plurality of series-connected resistors; and a control circuit for controlling ON-state resistances of the plurality of switch elements. The control circuit controls the ON-state resistances of the plurality of switch elements so as to obtain a predetermined ratio to a resistance of the plurality of series-connected resistors of the resistor circuit. | 12-15-2011 |
| 20120161843 | ATTENUATION CONTROL DEVICE, SIGNAL ATTENUATION DEVICE, AUTOMATIC GAIN CONTROL DEVICE, ATTENUATION CONTROL METHOD, AND AUTOMATIC GAIN CONTROL METHOD - An attenuation control device is provided in a receiver of a high-frequency signal and attenuates the high-frequency signal. The attenuation control device includes a computing unit to output digital data for controlling an amount of attenuation of the high-frequency signal, and a DA converter to perform DA conversion of the digital data into a control current which controls a current which is passed through a PIN diode for attenuating the high-frequency signal, wherein the DA converter outputs an analog current as the control current, which is corrected so that a logarithmic value of the amount of attenuation of the high-frequency signal is allowed to change substantially linearly to the digital data. | 06-28-2012 |
| 20120212277 | METHOD AND SYSTEM OF A SENSOR INTERFACE HAVING DYNAMIC AUTOMATIC GAIN CONTROL DEPENDENT ON SPEED - Embodiments of the invention described herein provide a magnetic sensor interface capable of adjusting signal conditioning dynamically using a speed signal of a target such that the true positive and negative peaks of the input signal are maintained for the given target across its entire speed range (0-Max rpm), therefore increasing the signal to noise ratio at low speeds and avoiding clipping or distortion at high speeds. In one aspect, a method comprises receiving an alternating differential voltage signal from a sensor. The differential voltage signal has an amplitude that changes relative to a change in speed of a target. The alternating differential voltage signal is converted to an attenuated single-ended voltage signal that can be dynamically scaled. The attenuated single-ended voltage signal can be scaled by multiplying the attenuated single-ended voltage signal by a scaling factor. The scaling factor is selected relative to the speed signal and is selected relative to a signal-to-noise ratio of the scaled attenuated single-ended voltage signal. | 08-23-2012 |
| 20120249209 | TRANSMISSION SYSTEM - Provided is a transmission system capable of improving the SN ratio for noise superimposed on a transmission line and extending the dynamic range. The transmission system transmits a signal between a transmitter ( | 10-04-2012 |
| 20120256674 | APPARATUS AND METHOD FOR LINEARIZING FIELD EFFECT TRANSISTORS IN THE OHMIC REGION - Apparatus and methods are disclosed related to using one or more field effect transistors as a resistor. One such apparatus includes a field effect transistor with a first series circuit in parallel with the gate and the source of the field effect transistor and a second series circuit in parallel with the gate and the drain of the field effect transistor. Each series circuit can include a capacitor and a switch in series with the capacitor. The switch can be configured to be on when the field effect transistor is on, and to be off when the field effect transistor is off. This can improve the linearity of the field effect transistor as a resistor. In some implementations, the apparatus can further include an isolation resistor having a first end and a second end, the first end electrically coupled to the gate of the field effect transistor. | 10-11-2012 |
| 20120280738 | VARIABLE ATTENUATOR HAVING STACKED TRANSISTORS - In one embodiment, a variable attenuator is disclosed having an attenuation circuit and a control circuit. The attenuation circuit may include a first series connected attenuation circuit segment and a shunt connected attenuation circuit segment, as well as additional attenuation circuit segments. Each attenuation circuit segment includes a stack of transistors that are coupled to provide the attenuation circuit segment with a variable impedance level having a continuous impedance range. In this manner, the control circuit may be operably associated with the stack of transistors in each attenuation circuit segment to control the variable attenuation level of the variable attenuator. | 11-08-2012 |
| 20120319755 | HIGH LINEAR VOLTAGE VARIABLE ATTENUATOR (VVA) - An apparatus comprising one or more series transistor network elements and a plurality of shunt circuits. The series transistor network may be configured to generate an output signal in response to (i) an input signal, (ii) a first bias signal, and (iii) a plurality of variable impedances. The plurality of shunt circuits may each be configured to generate a respective one of the variable impedances in response to a second bias signal. The output signal may have an attenuation that is equal to or less than the input power. The amount of the attenuation may be controlled by the first bias signal and the second bias signal. The series transistor elements and the plurality of shunt circuits may be configured as two or more transistors each having two or more gates. | 12-20-2012 |
| 20130099845 | SYSTEM AND METHOD OF TRANSISTOR SWITCH BIASING IN A HIGH POWER SEMICONDUCTOR SWITCH - A circuit and method are provided for switching in a semiconductor based high power switch. Complementary p-type based transistors are utilized along insertion loss insensitive paths allowing biasing voltages to alternate between supply and ground, allowing for negative voltage supplies and blocking capacitors to be dispensed with, while improving performance. | 04-25-2013 |
| 20130127513 | TEMPERATURE COMPENSATION ATTENUATOR - In one embodiment, a temperature compensating attenuator is disclosed having an attenuation circuit and a control circuit. The temperature compensating attenuator circuit may include a first series connected attenuation circuit segment and a shunt connected attenuation circuit segment, as well as additional attenuation circuit segments. Each attenuation circuit segment includes a stack of transistors that are coupled to provide the attenuation circuit segment with an impedance attenuation level having a continuous impedance range. The control circuit may be operably associated with the stack of transistors in each attenuation circuit segment to control the attenuation level of the attenuation circuit. The temperature compensating attenuator includes a temperature compensating circuit that compensates for variations in operation of the attenuation circuit due to a temperature change. | 05-23-2013 |
| 20130141152 | VOLTAGE CONTROLLED VARIABLE RESISTOR SUITABLE FOR LARGE SCALE SIGNAL APPLICATION - A voltage controlled variable resistor circuit is configured to variably attenuate a variable source signal. A fixed attenuation circuit is coupled to receive the variable source signal and output an attenuated variable source signal. The variable source signal is further applied across a variable resistive divider formed of a fixed resistive circuit and a variable resistive circuit. The variable resistive circuit has a first input configured to receive the attenuated variable source signal and a second input configured to receive a variable resistance control signal. The variable resistive circuit is configured to have a resistance which is variable in response to the attenuated variable source signal and the variable resistance control signal. | 06-06-2013 |
| 20130214841 | Low Distortion MOS Attenuator - An attenuation circuit uses a voltage controlled variable resistance transistor as a signal attenuator for receivers operating in the zero Hz to about 30 MHz range. The transistor functions in the linear region to linearize the transistor resistance characteristics used for signal attenuation. In an exemplary application, the attenuation circuit is used as an RF attenuator for AM radio broadcast receivers and amplifiers with automatic gain control. Multiple attenuation circuits can be coupled in parallel, each attenuation circuit having a different sized variable resistance transistor, to form sequentially activated stages that increase the range of attenuation while minimizing distortion. | 08-22-2013 |
| 20130278317 | SWITCHABLE CAPACITIVE ELEMENTS FOR PROGRAMMABLE CAPACITOR ARRAYS - Switchable capacitive elements are disclosed, along with programmable capacitor arrays (PCAs). One embodiment of the switchable capacitive element includes a field effect transistor (FET) device stack, a first capacitor, and a second capacitor. The FET device stack is operable in an open state and in a closed state and has a plurality of FET devices coupled in series to form the FET device stack. The first capacitor and the second capacitor are both coupled in series with the FET device stack. However, the first capacitor is coupled to a first end of the FET device stack while the second capacitor is coupled to a second end opposite the first end of the FET device stack. In this manner, the switchable capacitive element can be operated without a negative charge pump, with decreased bias swings, and with a better power performance. | 10-24-2013 |
| 20130285729 | TRIMMING CIRCUIT FOR CLOCK SOURCE - A semiconductor trimming circuit includes parallel coupled PMOS devices coupled in parallel with parallel coupled NMOS devices and an additional pair of dummy NMOS devices. The dummy NMOS devices are coupled in parallel with the NMOS devices. A trimming circuit for an internal clock source may be formed with an array of such switches for selecting one or more trimming capacitors of the trimming circuit. Such an array has a low leakage current and permits good trimming linearity. | 10-31-2013 |
| 20140210538 | MULTIPLE RAMP VARIABLE ATTENUATOR - The present disclosure provides an attenuator and associated methods of operations. An exemplary attenuator includes an input terminal, an output terminal, a voltage reference terminal, a first attenuation segment coupled with the input terminal and the output terminal, and a second attenuation segment coupled with the first attenuation segment and the voltage reference terminal. The attenuator further includes at least two switches coupled with the input terminal and the output terminal in parallel with the first attenuation segment, where at least some of the at least two switches have an associated voltage control terminal. For example, the attenuator includes a first switch and a second switch coupled with the input terminal and the output terminal in parallel with the first attenuation segment, wherein a first voltage control terminal is coupled with the first switch and a second voltage control terminal is coupled with the second switch. | 07-31-2014 |
| 20140210539 | Low Distortion MOS Attenuator - An attenuation circuit uses a voltage controlled variable resistance transistor as a signal attenuator for receivers operating in the zero Hz to about 30 MHz range. The transistor functions in the linear region to linearize the transistor resistance characteristics used for signal attenuation. In an exemplary application, the attenuation circuit is used as an RF attenuator for AM radio broadcast receivers and amplifiers with automatic gain control. Multiple attenuation circuits can be coupled in parallel, each attenuation circuit having a different sized variable resistance transistor, to form sequentially activated stages that increase the range of attenuation while minimizing distortion. | 07-31-2014 |
| 20140312953 | EQUALIZER CIRCUIT AND RECEIVER CIRCUIT INCLUDING THE SAME - An equalizer circuit includes an input terminal, a pull-up driving unit suitable for pull-up driving an output terminal based on a signal of the input terminal, a pull-down driving unit suitable for pull-down driving the output terminal, and a capacitor connected between the input terminal and the output terminal. | 10-23-2014 |
| 20150084681 | Variable Attenuator - A variable attenuator comprises a series resistance, and an adjustable shunt resistance, wherein the adjustable shunt resistance comprises a series circuit of a fixed resistor and a semiconductor element having an adjustable resistance. | 03-26-2015 |
| 20150326204 | APPARATUS AND METHODS FOR DIGITAL STEP ATTENUATORS WITH SMALL OUTPUT GLITCH - Apparatus and methods for digital step attenuators are provided herein. In certain configurations, a DSA includes a plurality of DSA stages that can be set in an attenuation mode or in a bypass mode using a plurality of switching circuits. A first switching circuit of the plurality of switching circuits includes a field effect transistor (FET) switch, a gate resistor, one or more gate resistor bypass switches, and a pulse generation circuit. The gate resistor is electrically connected between a switch control input and a gate of the FET switch, and a switch control signal can be provided to the switch control input to turn on or off the FET switch. In response to detecting a rising and/or falling edge of the switch control signal, the pulse generation circuit can control the one or more gate resistor bypass switches to bypass the gate resistor. | 11-12-2015 |
| 20160049922 | Memory Interface Receivers Having Pulsed Control Of Input Signal Attenuation Networks - Receivers for memory interfaces and related methods are disclosed having pulsed control of input signal attenuation networks. Embodiments include a DC common mode attenuation network, an AC coupling network, a pulse generator, and an amplifier. The pulse generator receives the output of the amplifier and generates a pulse signal that in part controls the operation of the attenuation network. The attenuation network generates an attenuated signal having reduced DC common mode levels. This attenuated signal is combined with an AC component passed by the AC coupling network. The resulting combined signal is detected and amplified by the amplifier. Different voltage domains are used for the attenuation network and the AC coupling network as compared to the amplifier and the pulse generator. By attenuating DC common mode levels while maintaining AC signal levels, the disclosed embodiments allow for proper signal detection over a wide range of DC common mode levels. | 02-18-2016 |
| 20160079959 | PROGRAMMABLE STEP ATTENUATOR WITH CROSS CONNECTION - Disclosed examples include a programmable attenuator circuit providing selective cross coupling of impedance components between circuit input nodes and output nodes according to control signals to set or adjust an attenuation value of the attenuator circuit. The attenuator circuit includes a plurality of attenuator impedance components, and a switching circuit to selectively connect at least a first attenuator impedance component between the first input node and the second output node, to selectively connect at least a second attenuator impedance component between the second input node and the first output node, to selectively connect a third attenuator impedance component between the first input node and the first output node, and to selectively connect a fourth attenuator impedance component between the second input node and the second output node. | 03-17-2016 |
| 20160112032 | Reflective Vector Modulators - Technologies for RFID positioning and tracking apparatus and methods are disclosed herein. The apparatus and methods disclose a radio-frequency identification positioning system that includes a radio-frequency identification reader and a phased-array antenna coupled to the radio-frequency identification reader. Techniques are applied to reduce in-reader and in-antenna signal leakages. Techniques are applied to position and track RFID tags. Circuits with leakage cancellation abilities are also disclosed. Reflective vector attenuators with tunable impedance load are also disclosed. Polarization adjustable antennas with matching circuits used in the RFID positioning system are also disclosed. Circuits to re-transmit a received signal at a higher amplitude to enhance radio link range are also disclosed. Techniques are applied to increase the level of scattered radio signals from RFID tags. | 04-21-2016 |
| 20160134259 | Digital Step Attenuator with Reduced Relative Phase Error - An apparatus for selectively providing attenuation with minimal relative phase error. A Digital Step Attenuator (DSA) is implemented on an integrated circuit (IC). Each cell of the DSA has a series compensation inductance that is introduced between an input to the cell and a resistor on the cell. The series compensation inductance allows the location of a pole present in the transfer function of the cell to be manipulated. By controlling the location of the pole in the transfer function of the DSA, the relative phase error of the cell can be controlled. In another disclosed embodiment, the capacitance of a shunt compensation capacitor is increased to manipulate a pole in the transfer function of a DSA cell. | 05-12-2016 |
