Class / Patent application number | Description | Number of patent applications / Date published |
327558000 | Lowpass | 20 |
20080204129 | Simplified Sallen-Key Low-Pass Filter Circuit - The Sallen-Key low-pass filter circuit comprises a first resistor ( | 08-28-2008 |
20080246539 | CAPACITOR MULTIPLER CIRCUITS AND THE APPLICATIONS THEREOF TO ATTENUATE ROW-WISE TEMPORAL NOISE IN IMAGE SENSORS - The various embodiments disclose capacitor multiplier circuits that may be integrated into imaging devices, such as for semiconductor Complimentary Metal Oxide Semiconductor (CMOS) image sensors, to create an effective capacitance in response to a low frequency, such as row-wise temporal noise, that may be generated along a row of image sensor pixels. The created effective capacitance from any one of the capacitor multiplier circuits along with a small signal resistance created by a trans-conductance of a current biasing transistor form a low pass filter that will attenuate the low frequency noise. | 10-09-2008 |
20080297240 | Filter Circuit and Semiconductor Device - A filter circuit includes a low-pass filter and a calibration circuit calibrating a frequency characteristic of the low-pass filter. The calibration circuit includes a negative feedback circuit and a control circuit. | 12-04-2008 |
20080303589 | HIGH-ORDER LOW-PASS FILTER CIRCUIT AND METHOD - A low-pass filtering circuit and method are disclosed. The circuit includes a low-pass filter with a capacitor, and a multiplier configured to multiply the capacitance of the capacitor by feeding-back a high-frequency signal apparent in an output signal of the low-pass filter to the capacitor. | 12-11-2008 |
20090140799 | INTEGRATED RC FILTER - An integrated RC filter includes a first resistor that is coupled to a first capacitor through a first node, a signal input of the integrated RC filter being coupled through one of the first resistor and the first capacitor to the first node. To allow for an increase in the RC timeconstant τ of the RC filter without losing signal transparency, an amplifier is included between the signal input and one of the first resistor and the first capacitor having a gain factor substantially larger than unity, the first node being coupled through an attenuator to a signal output, the attenuator having an attenuation factor substantially corresponding to the amplifier's gain factor. | 06-04-2009 |
20090189687 | MULTI-MODE RECONSTRUCTION FILTER - A circuit (e.g., a reconstruction filtering circuit) may include a single operational amplifier (op-amp) that is arranged to receive a voltage input and that is arranged to have a biasing of constant g | 07-30-2009 |
20110221519 | SEMICONDUCTOR INTEGRATED CIRCUIT AND HIGH FREQUENCY MODULE USING THE SAME - The present invention reduces harmonic components of an RF transmission output signal. In the semiconductor integrated circuit which the present invention provides, a transmission switch of an antenna switch thereof includes transmission field effect transistors whose S-D current paths are coupled between a transmission terminal and an input/output terminal and whose gate terminals are coupled to a transmission control terminal. A reception switch of the antenna switch includes reception field effect transistors whose S-D current paths are coupled between the input/output terminal and a reception terminal and whose gate terminals are coupled to a reception control terminal. The transmission and reception n-channel MOS field effect transistors are respectively formed in a silicon-on-insulator structure. A substrate voltage of a voltage generator, set to reducing each harmonic component of the antenna switch, is supplied to the transmission control terminal and the reception coupled to a support silicon substrate having the SOI structure. | 09-15-2011 |
20110234310 | Second-Order Low-Pass Filter - A low-pass filter, including: between a first terminal and a second terminal, a series association of a first resistor, of a second resistor, and of a first amplifier; in parallel with the second resistor, a series association of a second amplifier and of a first capacitor; a second capacitor between an input of the first amplifier and a third terminal of application of a reference voltage; and a third capacitor between the second terminal and the third terminal. | 09-29-2011 |
20120112826 | ACTIVE LOW PASS FILTER - Sallen-Key active low pass filters (LPFs) have been knows for many years; however, these LPFs generally include passive components (i.e., resistors and capacitors) and active components (i.e., amplifiers) that are within the direct signal path that can contribute to the noise at the output of the filter within the pass band. Here, an LPF (which has the same general behavior as a Sallen-Key LPF) has been provided that AC couples passive components and active components to the direct signal path so as to suppress the noise contribution in the pass band. | 05-10-2012 |
20120146717 | APPLYING TRENCHED TRANSIENT VOLTAGE SUPPRESSOR (TVS) TECHNOLOGY FOR DISTRIBUTED LOW PASS FILTERS - An electronic circuit includes a filtering circuit implemented with a distributed inductor-and-capacitor (LC) network that includes metal oxide effect (MOS) trenches opened in a semiconductor substrate filled with dielectric material for functioning as capacitors for the distributed LC network. The electronic circuit further includes a transient voltage suppressing (TVS) circuit integrated with the filtering circuit that functions as a low pass filter wherein the TVS circuit includes a bipolar transistor triggered by a diode disposed in the semiconductor substrate. The distributed LC network further includes metal coils to function as inductors disposed on a top surface of the semiconductor electrically contacting the MOS trenches. | 06-14-2012 |
20120218035 | FILTER CIRCUIT - In a filter circuit comprising a plurality of low pass filters (LPFs) that are connected in series, each of the plurality of LPFs comprises a switched-capacitor circuit (SC), and a fully-differential amplifier (AMP) which amplifies a signal output from the SC, and outputs the amplified signal. An AMP of an LPF which inputs a signal output from a 1-bit digital-to-analog converter (DAC) comprises a discrete-time type common-mode feedback circuit, and an AMP of an LPF which outputs a signal output from the filter circuit comprises a continuous-time type common-mode feedback circuit. | 08-30-2012 |
20120326774 | SWITCHING CIRCUIT - A switching circuit according to one embodiment includes: a switching element that has a first terminal and a second terminal, and is driven by a pulse signal to switch a conduction state between the first and second terminals; a power source section that supplies a voltage to the first terminal; a load circuit that is connected in parallel with the power source section; a passive circuit section that is connected between a connection point between the power source section and the load circuit, and the first terminal, and suppresses a current flowing from the connection point to the switching element at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse signal; and a resonant circuit section that is connected between the passive circuit section and the connection point, and resonates at the frequency of N times. | 12-27-2012 |
20130207718 | FILTERS WITH ORDER ENHANCEMENT - A filter is provided. The filter receives an input signal and generates an output signal according to the input signal. The filter includes an input network, a high-pass network, and an operational circuit. The first input network provides a first normal path for the input signal to generate a first normal signal. The first high-pass network provides a first high-pass path for the input signal to generate a first high-pass signal. The operational circuit has first and second input terminals. The polarity of the second input terminal is inverse to that of the first input terminal. The operational circuit receives the first normal signal by the first input terminal and the first high-pass signal by the second input terminal such that a subtraction operation is performed on the first normal signal and the first high-pass filter to accomplish a low-pass filtering operation for generating the output signal. | 08-15-2013 |
20130249625 | SIGNAL GENERATION APPARATUS AND SIGNAL GENERATION METHOD - In order to output an accurate waveform in which quantization noise has been cancelled out, provided is a signal generating apparatus that outputs an output signal corresponding to a waveform data sequence expressing a waveform, the signal generating apparatus comprising a DA converting section that outputs an analog signal by sequentially performing digital/analog conversion on each piece of data included in the waveform data sequence, at a timing of a sampling clock; and a jitter injecting section that injects jitter decreasing a quantization noise component of the output signal, into the sampling clock supplied to the DA converting section. | 09-26-2013 |
20130278330 | LOW PASS FILTER WITH AN INCREASED DELAY - A low pass filter comprises a filter input node configured to receive a first logic signal, a filter output node configured to supply a second logic signal, a resistive element comprising a first terminal coupled to the input node and a second terminal coupled to the output node, and a capacitive element comprising a first terminal coupled to the output node and a second terminal. The filter further comprises an inverting gate having a first terminal coupled to the input node and a second terminal coupled to the second terminal of the capacitive element. | 10-24-2013 |
20140312966 | ACTIVE EMC FILTER - Active EMC filter connectable between an electric power source and an electric load, comprising: capacitors (C×N, C×U) connected between active conductors of said power source and a star point electric node; a filter capacitor (Cst, CstU) connected between said star point and ground; | 10-23-2014 |
20150137882 | ANALOG ACTIVE LOW-PASS FILTERS - Apparatus and methods for high-frequency low-pass filtering are disclosed. A first resistor is operatively coupled between a first node and a second node. A second resistor is operatively coupled between the second node and a third node. An amplifier circuit has a first input operatively coupled to the third node and a first output operatively coupled to a fourth node. The first output is configured to provide a first output signal. A first complex impedance network is operatively coupled between the fourth node and the third node. A first feedback path is operatively coupled between the fourth node and the second node. The first feedback path is configured to invert at least a portion of the first output signal. The first feedback path is further configured to provide a first feedback capacitance at the second node. | 05-21-2015 |
20150303897 | IF-Noise-Shaping Transistorized Current-Mode Lowpass Filter Utilizing Cross Coupled Transistors - An IF-noise-shaping transistorized current-mode lowpass filter is applied to quadrature in a balanced circuit. A first pair of transistors receiving current inputs from a mixer are connected so that each of the first pair of transistors has its gate cross coupled to the output of the other of the first pair of transistors. A second pair of transistors are connected in series with respected outputs of respective ones of the first pair of transistors and having gates connected to a first common voltage node, and a capacitance is used to connect the current inputs of one of the first and second pairs of transistors. An active inductive load is connected between the current inputs of one of the first and second pairs of transistors. | 10-22-2015 |
20150365070 | SEMICONDUCTOR DEVICE - In some aspects of the invention, provided is a semiconductor device capable of compensating sufficiently instantaneous drop of power source voltage without enlarging device scale extremely. When digital circuit and power device driving circuit are formed on chip in the state connected to power source in common in parallel, for digital circuit of functional circuit remaining abnormal state after power source recovery and analog circuit and power device driving circuit of functional circuit retaining continuously normal state even before power source recovery, resistors are formed on chip in power source E side of the functional circuits, and in addition, capacitors are formed on chip | 12-17-2015 |
20160149559 | Low-Pass Filter - A low-pass filter comprising: a filter input terminal; a filter output terminal; a filter FET configured to provide a resistance between the filter input terminal and the filter output terminal; a filter capacitor connected between the filter output terminal and a reference terminal; a bias FET configured to provide a bias voltage to the filter FET; a buffer connected between the filter input terminal and the bias FET, the buffer configured to source a bias current for the bias FET; and an offset voltage source configured to contribute to the bias voltage provided to the filter FET. | 05-26-2016 |