Patent application number | Description | Published |
20090251156 | METHOD AND SYSTEM THAT DETERMINES THE VALUE OF A RESISTOR IN LINEAR AND NON-LINEAR RESISTOR SETS - The present invention employs identically sized mirror transistors arrange in groups that may be preferentially addressed and activated to determine the value of a resistor. Known current are directed through the resistor, and the voltage developed is measured by comparing against a reference voltage. The current is increased or decreased by the least significant value until the voltage across the resistor matches the reference voltage. A successive approximation or other known technique may be used instead. A reference current is developed that temperature stable and that is trimmed when manufactured to reduce process effects. The reference voltage may be constructed to be independent form a local power source so that the system is relatively independent of process, voltage and temperature, PVT. | 10-08-2009 |
20100026261 | MULTI-LEVEL SIGNALING - A control circuit generates an output based on the first signal and the second signal by encoding the output to be a multi-state signal having at least three states. A magnitude of the multi-state signal generated by the controller varies depending on binary states of the first signal and the second signal. The controller utilizes the output (i.e., the multi-state signal) to control a switching circuit. A driver circuit receives the output generated by the control circuit. In one embodiment, the multi-state signal has more than two different logic states. The driver decodes the multi-state signal for generating signals to control switches in the switching circuit. One signal generated by the driver circuit is a pulse width modulation signal; another signal generated by the driver circuit is an enable/disable signal. | 02-04-2010 |
20100060337 | POWER SUPPLY INSENSITIVE VOLTAGE LEVEL TRANSLATOR - A circuit is described that when the power supply to circuits that control a pass transistor is at zero volts, the pass transistor configured as a voltage level translator remains off regardless of the voltages and changes in voltages at the ports connected to the pass transistor. Cross coupled transistors provide a mechanism where the higher of the port voltages is available to power circuitry that maintains the control input of the pass transistor in the off condition. The voltages at the ports may rise and fall relative to each other, but the control input of the pass transistor will keep the pass transistor off. | 03-11-2010 |
20100315750 | OVER-CURRENT PROTECTION CIRCUIT WITH FOLDBACK CAPABILITY - An over-current protection circuit is disclosed that provides a current limit threshold using resistors in the path of a scaled mirror current of a load current. The protective circuit has a first state that passes a supply source to a device, but when the threshold is reached the circuit becomes a feedback circuit that allows only a set final current to be passed to the device. When the load current reaches the threshold, the mirror current reaches a corresponding threshold that triggers a comparator and circuitry that then limits and fold backs the load current. | 12-16-2010 |
20110018517 | MULTI-LEVEL SIGNALING - A control circuit generates an output based on the first signal and the second signal by encoding the output to be a multi-state signal having at least three states. A magnitude of the multi-state signal generated by the controller varies depending on binary states of the first signal and the second signal. The controller utilizes the output (i.e., the multi-state signal) to control a switching circuit. A driver circuit receives the output generated by the control circuit. In one embodiment, the multi-state signal has more than two different logic states. The driver decodes the multi-state signal for generating signals to control switches in the switching circuit. One signal generated by the driver circuit is a pulse width modulation signal; another signal generated by the driver circuit is an enable/disable signal. | 01-27-2011 |
20110084759 | HIGH IMPEDANCE BIAS NETWORK - This document discusses, among other things, a system and method for offsetting reverse-bias leakage of a high impedance bias network. In an example, an apparatus includes an anti-parallel diode pair coupled between a signal node and a common-mode node. The anti-parallel diode pair can include a first diode and a second diode coupled to the first diode. A third diode can be coupled between a supply node and the signal node, and the third diode can be sized to compensate for a parasitic diode junction of the anti-parallel diode pair. | 04-14-2011 |
20110199123 | MULTIPLE DETECTION CIRCUIT FOR ACCESSORY JACKS - This document discusses, among other things, a multiple accessory detection apparatus and methods for identifying accessories coupled to a multi-pin connector of an electronic device. The apparatus can include a first reference generator, a second reference generator, a plurality of switches to couple an output of the second generator to an accessory device and a comparator. The comparator can generate identifying information about the accessory device using the reference information received from the first reference generator and test information received using the second reference generator. | 08-18-2011 |
20120056668 | HIGH-IMPEDANCE NETWORK - Apparatus and methods for an integrated circuit, high-impedance network are provided. In an example, the network can include an anti-parallel diode pair coupled between first and second nodes. The anti-parallel diode pair can include a first diode including a P+/N | 03-08-2012 |
20120056671 | INTEGRATED CIRCUIT SINGLE ENDED-TO-DIFFERENTIAL AMPLIFIER - Apparatus and methods for an integrated circuit, single ended-to-differential amplifier are provided. In an example, the amplifier can include an amplifier circuit having a first input configured to receive a single-ended signal, a second input, and a differential output configured to provide an amplified representation of the single-ended signal. The amplifier can include a filter circuit configured to balance a common-mode voltage between the first and second inputs of the amplifier circuit. The filter circuit can include a common-mode input configured to receive the common-mode voltage, a first impedance network coupled between the common-mode input and the first input of the amplifier circuit, and a second impedance network coupled between the common-mode input and the second input of the amplifier circuit. The filter circuit can provide a low frequency pole below 1 hertz. | 03-08-2012 |
20120182068 | DC OFFSET TRACKING CIRCUIT - This document discusses, among other things, an amplifier circuit including first and second amplifiers configured to receive an input signal and to provide a differential output signal using a feedback loop including a transconductance amplifier. A non-inverting input of a first amplifier can be configured to receive an input signal. The feedback loop can be configured to receive the outputs from the first and second amplifiers and to provide a feedback signal to the non-inverting input of the second amplifier, for example, to reduce a DC offset error or to increase a dynamic range of the amplifier circuit. | 07-19-2012 |
20120223728 | METHOD AND SYSTEM THAT DETERMINES THE VALUE OF A RESISTOR IN LINEAR AND NON-LINEAR RESISTOR SETS - The present subject matter refers to apparatus and methods for identifying a resistance level of a resistor. In an example, circuit configured to identify a resistor can include a plurality of current sources, each current source selectively coupled to the resistor to generate a resistor voltage, a comparator configured to compare the resistor voltage and a reference voltage, and to provide an output indicative of the comparison, and a controller configured to selectively couple a first one or more current sources of the plurality of current sources to the resistor, and to selectively couple a second one or more current sources of the plurality of current sources to the resistor in response to the output indicative of the comparison. | 09-06-2012 |
20120229109 | LAMBDA CORRECTION FOR CURRENT FOLDBACK - Method and apparatus to provide lambda correction of a current foldback circuit using a regulator including a current foldback circuit are disclosed herein. | 09-13-2012 |
20120230500 | ECM DIGITAL MICROPHONE TEMPERATURE COMPENSATION - This document discusses, among other things, systems and methods to at least partially compensate for temperature sensitivity in a digital microphone system including, for example, a temperature sensitive membrane, such as an electrets condenser microphone (ECM). | 09-13-2012 |
20130154601 | REGULATOR TRANSIENT OVER-VOLTAGE PROTECTION - This document discusses, among other things, apparatus and methods for providing over-voltage transient protection of a voltage regulator. In an example, an apparatus can include a first transistor including a control node and first and second switch nodes, and a low-pass filter configured to couple to the control node of the first transistor and to switch the first transistor to a first state when a voltage change of the supply voltage exceeds a threshold. The first transistor, in the first state, can be configured to couple a control node of a second transistor to the supply voltage to protect components coupled to a regulator transistor. | 06-20-2013 |
20150015333 | DIFFERENTIAL MEASUREMENTS WITH A LARGE COMMON MODE INPUT VOLTAGE - An apparatus comprises a differential amplifier circuit and a current source. The differential amplifier circuit is configured to receive a voltage at an input, wherein the differential amplifier circuit generates an output voltage having a magnitude proportional to the received voltage over a voltage range to be measured at a specified output common mode voltage. The current source is electrically connected to an input of the differential amplifier circuit and is configured to subtract a midpoint of a voltage range of the battery voltage to be measured at the input of the differential amplifier, wherein a circuit supply voltage provided to the differential amplifier circuit and the current source is less than the voltage at the input. | 01-15-2015 |
Patent application number | Description | Published |
20110009159 | Method for capturing files with a portable electronic device - A method of capturing, cataloging, and presenting files with a portable electronic device includes capturing files having a plurality of formats of data with the portable electronic device, generating a geographical tag (geotag) based on a current location of the portable electronic device for each file with the portable electronic device and attaching the geotag to the file, generating a timestamp for each file with the portable electronic device and attaching the timestamp to the file, storing the files having the attached geotags and timestamps, and presenting the files according to corresponding geographical locations, timestamps, or formats of the files. | 01-13-2011 |
20110074693 | Method of processing touch commands and voice commands in parallel in an electronic device supporting speech recognition - A method of processing touch commands and voice commands in parallel in an electronic device supporting speech recognition includes detecting a touch-down event on a touch-sensitive screen of the electronic device when touch input is sensed on the touch-sensitive screen, the touch-sensitive screen displaying one or more soft buttons, each soft button executing a corresponding command upon activation of the soft button. A microphone of the electronic device is activated to receive voice instructions in response to detecting the touch-down event. A touch-up event is detected when touch input is no longer sensed on the touch-sensitive screen, and it is determined whether a voice command was detected in a time period between the touch-down event and the touch-up event. The voice command is then executed if the voice command was detected. | 03-31-2011 |
20110172917 | Adjusting a level of map detail displayed on a personal navigation device according to detected speed - A method of adjusting a level of map detail for content displayed on a personal navigation device includes displaying a map of a current location of the personal navigation device on a display of the personal navigation device, calculating a current speed of the personal navigation device, adjusting a level of map detail according to the current speed of the personal navigation device to create an updated map, and displaying the updated map on the display of the personal navigation device. | 07-14-2011 |