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8497746 Switched-capacitor band-pass filter of a discrete-time type, in particular for cancelling offset and low-frequency noise of switched-capacitor stages  
A band-pass filter made up by an operational amplifier and by an input circuit. The input circuit is formed by a capacitive filtering element, connected to the input of the operational amplifier;...
8412131 Down conversion filter and communication receiving apparatus  
A down-conversion filter is provided, using first and second input terminals to receive signals that are differentially outputted by a preceding circuit, and using an output terminal to output a...
8334733 Left-handed filter for use in mobile phone provided with wide band and improved propagation characteristics  
A left-handed filter of the present invention includes an interstage coupling element connected to a first capacitor and a ground, a second capacitor connected to the interstage coupling element,...
8179183 Low-consumption switched-capacitor circuit  
A switched-capacitor circuit including at least one first capacitor and a circuit for switching at least one armature of the first capacitor alternately to one and the other of two terminals at a...
8022575 Damping electromagnetic oscillations in power systems  
Exemplary embodiments of the present disclosure provide a method and controller for damping multimode electromagnetic oscillations in electric power systems which interconnect a plurality of...
7979047 Sampling filter  
The present invention aims at providing a sampling filter capable of changing a filtering characteristic without use of a complicate waveform as a control signal. A sampling filter 100 has a...
7965135 Charge sampling filter circuit and charge sampling method  
To provide a charge sampling filter circuit and a charge sampling method. A charge sampling filter circuit includes a first capacitor that samples an input signal, and in which at least a portion...
7209792 RF-energy modulation system through dynamic coil detuning  
An RF-energy modulation system dynamically adjusts tuned receiving circuits within a plurality of slave devices, thereby regulating the level of power reception in each slave device. The slave...
7183880 Discrete inductor bank and LC filter  
A discrete inductive-capacitive (LC) filter selects between at least two inductor banks to tune the LC filter. The filter receives an input signal that includes one or more bands of frequencies. A...
7057452 Method and circuit for correcting the offset of an amplification chain  
A circuit for correcting the offset of an amplification and filtering chain having a predetermined gain and cut-off frequency depending on the value of at least one capacitor, comprising: a...
6927722 Series capacitive component for switched-capacitor circuits consisting of series-connected capacitors  
A series capacitive component for use in signal processing applications such as analog-to-digital (A/D) converters, switched capacitor circuits and the like that require matched capacitors is...
6825739 Switched capacitor circuit  
A non-inverting-side first switch is formed in a first area on one of sides of a differential amplifier, meanwhile a non-inverting-side second switch is formed in a second area on the other of...
6738603 Radio communication apparatus with retractable antenna and its impedance matching method  
A radio communication apparatus is provided, which realizes a desired impedance matching state between a retractable antenna and a circuit connected thereto in both a situation where the antenna...
6720843 Filter switching circuit having a shorter distance of connection for a higher frequency passband  
A filter switching circuit includes first and second amplifiers, relays, and bandpass filters in which a bandpass filter having a higher frequency passband is selected by a smaller number of...
6683514 Switched capacitor circuit  
A non-inverting-side first switch is formed in a first area on one of sides of a differential amplifier, meanwhile a non-inverting-side second switch is formed in a second area on the other of...
6590984 Sound quality regulation apparatus  
The sound quality regulation apparatus has one attenuation unit and one amplification unit connected in series in this order in the signal line of the apparatus. The output of the attenuation unit...
6466146 Hybrid low-pass sigma-delta modulator  
A hybrid loop filter includes an integrator having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers having an input...
6445321 Hybrid low-pass sigma-delta modulator  
A hybrid loop filter includes an integrator having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers having an input...
6437639 Programmable RC filter  
A programmable resistive-capacitive filter circuit enabling on-chip digital control of the frequency response includes a switched resistive type voltage divider network where one of the resistors...
6356143 Method and apparatus for filtering radio frequency signals  
A variable bandpass filter system passes a selected range of frequencies while rejecting other frequencies in an RF input signal. The system includes a switch and an oscillator. The switch...
6329939 Method and apparatus for minimizing mismatch in a complex filter  
A complex filter minimizing mismatch error by averaging the mismatch error by integrating the real and imaginary input signals using the same integrator. A further advantage is that, as compared...
6191648 Switched-capacitor cosine filter circuit  
A switched-capacitor cosine filter circuit includes a differential amplifier and a switched-capacitor circuit. A set of control signals cause the switched-capacitor circuit to selectively couple...
6163287 Hybrid low-pass sigma-delta modulator  
A hybrid loop filter includes an integrator having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers having an input...
6133775 Integrated circuit with switched capacitor  
A switched capacitor wherein one of the plates of the capacitor to be switched is fed with the input signal via a transistor switch receiving as control signal at the gate thereof a pulse train...
5973579 Ladder type intermediate frequency filter  
A piezoelectric filter is one not changing in the holding position of resonator in spite of impulse, small in the number of parts, easy to assemble from one direction, small, thin, and stable in...
5959565 Switched capacitor  
A switched capacitor includes two capacitors. During the charging period, the first capacitor is connected to an input potential and a first reference potential, and the second capacitor is...
5841822 Band-pass sigma-delta converter and commutating filter therefor  
A communication receiver (600) utilizes a band-pass sigma-delta converter (100) for receiving a radio signal. The band-pass sigma-delta converter (100) includes a comparator (106) coupled to an...
5838270 Second order and cascaded 2-1 oversampled modulators with improved dynamic range  
An oversampled modulator (FIGS. 1 and 4) for operation in a frequency band from DC to a finyite frequency having a transfer function containing a plurality of zeros, at least two of which are...
5757099 Hybrid parallel active/passive filter system with dynamically variable inductance  
A parallel hybrid active filter system for harmonic compensation of large non-linear loads is provided. The hybrid filter includes a passive filter connected in series with an inverter that is...
5745002 Low voltage, switched capacitance circuit employing switched operational amplifiers with maximized voltage swing  
A switched capacitance circuit, using a switched operational amplifier structure as an input switch of the switched capacitance, is provided with a new biasing circuit. An additional switched...
5736895 Biquadratic switched-capacitor filter using single operational amplifier  
The present invention discloses a biquadratic switched-capacitor filter, which merely utilizes one operational amplifier to implement a biquadratic transfer function. The biquadratic...
5724000 Differential switched capacitor filtering  
A differential switched capcitor filter section which includes a differential amplifier (OTA), a first set of switched capacitors (C11, C12) coupled between a non-inverting output (+) and an...
5699006 DC blocking apparatus and technique for sampled data filters  
A sampled data filter (400) provides on-chip blocking of DC signals. The addition of a very long time constant (VLTC) integrator (412) into the negative feedback path (414) of a first sampled data...
5680072 Differential interpolating switched capacitor filter and method  
A differential, interpolating, switched capacitor filter and method of operation in which non-interpolating stages of the filter are clocked at a first frequency and a subsequent interpolating...
5659269 Zero phase error switched-capacitor phase locked loop filter  
A loop filter for a phase locked loop (PLL) circuit may include two operational amplifiers and switched-capacitors connecting the inverted input and output of the operational amplifiers, the...
5638020 Switched capacitor differential circuits  
A switched capacitor differential circuit switches first and second differential input signals (Vinp1, Vinp2) to respective inputs (A, B) of an operational amplifier (12) via respective first and...
5625316 Tuning circuit for an RC filter  
A tuning circuit (202) uses a precision current reference (Iref) along with an analog-to-digital converter (218) to produce a digital output (228) to represent variations of internal resistance...
RE35494 Integrated active low-pass filter of the first order  
An integrated, low-pass filter of the first order made using the switched capacitors technique utilizes advantageously a single switched capacitor and only two switches in contrast to the filters...
5610564 AC integrated coupler with phase equalizer  
A monolithically integrated AC coupling circuit is presented for DC uncoupling and AC coupling (typically in telephone applications) to an input signal. The AC coupler includes a high-pass filter...
5523719 Component insensitive, analog bandpass filter  
A digitally driven, analog bandpass filter has an analog summer and two analog delay elements connected in a loop. An input signal to the filter is applied to a plus input terminal of the summer,...
5479130 Auto-zero switched-capacitor integrator  
A switched-capacitor auto-zero integrator includes and integrator circuit and a correction circuit. The integrator circuit may be any circuit including an operational amplifier having an input...
5466976 Time constant detecting circuit and time constant adjusting circuit  
A time constant detecting circuit incorporated in an LSI detects variations of component values of resistors and capacitors in the LSI by detecting variations of a time constant. A pseudo-resistor...
5438304 Automatically tuned notch filter for providing bandpass and band reject signals  
An automatically tuned filter apparatus having as input a signal of constant or slowly varying but unknown frequency superimposed on a second signal of rapidly varying frequency with a first...
5391999 Glitchless switched-capacitor biquad low pass filter  
A fully differential switched-capacitor biquad low pass filter (40) includes a first stage (54), second stage (56), common-mode circuits (55, 72), and feedback transmission gates (73, 74). The...
5379294 Multipurpose analog front-end circuit  
An analog front-end circuit has a low-group low-pass filter and a low-group high-pass filter connected in series, a high-group low-pass filter and a high-group high-pass filter connected in...
5369373 Comb data generation  
A sine wave oscillator provides an input signal to a step-recovery diode (SRD). The SRD produces a wideband series of harmonics of the frequency of the sine wave oscillator that are represented as...
5296822 Low pass filter circuit device and method having selectable cutoff frequency  
A device and method is provided for filtering frequency components of an electrical signal above a selectable low pass cutoff frequency which is changeable within a designated range. An input...
5187445 Tuning circuit for continuous-time filters and method therefor  
A tuning circuit (30) provides selection signals to a passive component array (80) in a continuous-time filter (70) to compensate for wide variations in values which are encountered in integrated...
5177484 Switched capacitor oversampling analog/digital converter with noise filtering  
An oversampling analog/digital converter includes a given number of at least three identically constructed switched-capacitor converter stages each being triggered by an analog input signal and...
5140325 Sigma-delta analog-to-digital converters based on switched-capacitor differentiators and delays  
Sigma-delta analog to digital converters based upon switched capacitor delay and switched capacitor differentiator circuits are described. These switched capacitor circuits have the advantages...

Matches 1 - 50 out of 212 1 2 3 4 5 >