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WO/2003/084085A1 |
A receiver apparatus (11) that converts a received signal directly to a baseband signal including a switched capacitor filter (19) that controls, based on a control signal applied to a switched capacitor element (27), a cutoff frequency ...
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WO/2003/056711A1 |
A noise filter circuit that is integrally molded on a semiconductor substrate and improves the precision of filtering out noise components. The noise filter circuit comprises a high−pass filter for detecting noise components included i...
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WO/2003/025515A1 |
The invention relates to a circuit for demodulating at least one modulated signal (e), preferably a measuring signal of a sensor, said circuit comprising at least one input (1), to which the signal (e) is applied. In order to permit an a...
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WO/2002/071621A2 |
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 and an output wherein each output of the p...
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WO/2002/043247A1 |
The invention relates to a method and system for implementing a digitally controlled sample and timing clock in a system performing analog and digital signal processing. According to the method, as the timing clock of the digital signal ...
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WO/2001/056157A1 |
A band pass filter (80) includes a pair of filters (82, 83) having different center frequencies and a difference amplifier (84) coupled to the outputs of the filters. The filters preferably have response curves that intersect at -3 dB. T...
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WO/2001/056156A1 |
An electrical signal is applied to a band pass filter (42), a first notch filter (43), and a second notch filter (44) in any order. The center frequencies of the notch filters straddle the pass band of the band pass filter. The notch fil...
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WO/2001/054270A1 |
An amplifier or filter circuit in switched capacitor circuit logic, comprising an amplifier or filter circuit in switched capacitor circuit logic with a switchable operation amplifier as an input stage of a switched opamp filter or ampli...
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WO/2001/050602A1 |
An integrated transient voltage pulse multiplier (360) is used to increase the voltage to the gates of control switches (310) in a low voltage circuit. The increased conductance of the control switches (310) permits a reduction in gate w...
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WO/2001/048924A1 |
A band pass filter (50) includes a pair of notch filters (51, 52) having different notch frequencies and a difference amplifier (54) coupled to the outputs of the notch filters. The notch filters preferably have response curves that inte...
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WO/2001/026339A1 |
A complementary comb filter (12) includes a plurality of band pass filters (13-17) and a plurality of notch filters (21-25), wherein the notch filters have the same center frequencies as the band pass filters or the same center frequenci...
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WO/2001/024471A1 |
A multiple channel signal processing circuit receives an input associated with a first channel and an input associated with a second channel. The respective inputs are sampled and processed by the circuit, which generates a sampled outpu...
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WO/2000/077929A1 |
A switched-capacitor circuit comprising a plurality of sequentially-operated switched-capacitors. A first capacitor is arranged to be coupled and thereafter uncoupled to an input signal during a first time period. Thereby the first capac...
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WO/2000/074236A1 |
The invention concerns a band-pass filtering method which consists in carrying out in parallel two frequency transpositions of an input signal to be filtered (SE) using respectively a first upstream mixing signal (SM1) and a second subst...
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WO/2000/074244A1 |
A reconstruction filter is described. An input is configured to receive an output signal from a digital to analog converter (400). An input sampling circuit (402) is operative to store a sample of the output signal from the digital to an...
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WO/2000/060745A1 |
A hybrid loop filter (100) includes an integrator (114) having an input and an output wherein the output forms an output of the hybrid loop filter, a plurality of transconductance amplifiers (130-1....130-n) having an input and an output...
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WO/2000/041311A1 |
Digital-to-analog conversion circuitry (100) is shown including a path for processing data in a 1-bit format. First portion of an analog finite impulse response filter (300) includes pre-selected number of delay elements (301) for receiv...
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WO/1999/035741A1 |
A switched capacitor circuit (60) reduces sampling noise by oversampling an input signal in space domain. The switched capacitor circuit (60) includes four sampling capacitors (72, 74, 76, 78) serially coupled together via five integrati...
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WO1999000899B1 |
A complex switched capacitor filter is formed by selecting (S3) an analog baseband prototype filter with the desired filter characteristics (S2). This prototype is converted (S4) into a corresponding real switched capacitor filter, and f...
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WO/1998/038732A1 |
A circuit is disclosed which can be used in quadrature analysis of modulated waveform, in a modulation system for generating the waveform or in a filter circuit which uses both demodulation and modulation. The demodulation system generat...
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WO/1997/015115A1 |
A differential switched capacitor filter section which comprises a differential amplifier (OTA), a first set of switched capacitors (C11, C12) coupled between a non-inverting output (+) and an inverting input (-) of the differential ampl...
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WO/1997/008629A1 |
Electrical filter or signal processor circuits are provided with internal companding for reduced sensitivity to noise while input-output response is as conventionally specified. In the continuous-time case, for a specified circuit descri...
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WO/1996/037953A1 |
A digital filtering method that includes sampling an input signal at a first rate, integrating the signal, sampling the integrated version at a different rate, and combining the sampled integrated version with the input signal. The metho...
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WO/1995/019073A2 |
A radio receiver has a frequency down conversion stage (28) including a first passive filter (50, 51, 52) tuned to a lower frequency. An amplifier (56, 58) functioning as a voltage to current converter (54) comprises a resistor (60) whic...
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WO/1995/013664A1 |
A method and apparatus integrate a plurality of input signals. A first integrator (225) integrates a first of the input signals and a second integrator (230) integrates a second of the input signals. A summer (235) is connected to the fi...
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WO/1995/013655A1 |
A level detector detects an input signal lever (205). A rectifier (210) receives the input signal and provides a rectified signal (215). A prefilter (220) receives the rectified signal and attenuates high frequency components at frequenc...
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WO/1995/001573A1 |
In an electrical test instrument for determining a loop impedance in a circuit breaker protected AC circuit, a test current of less than the circuit breaker trigger current is supplied to the circuit and the test voltage which develops d...
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WO/1994/023502A1 |
A switched capacitor one-bit digital-to-analog converter (10) is preferably utilized in the feedback path of a sigma delta modulator. The one-bit digital-to-analog converter (10) includes first and second capacitors (70, 72), a first swi...
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WO/1994/023494A1 |
A biquad switched capacitor filter is preferably utilized as the output filter in a sigma delta digital-to-analog converter. The switched capacitor filter uses a cross-coupled switched capacitor circuit which delivers charge to the capac...
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WO/1994/022216A1 |
A combined programmable gain and integrating amplifier comprises an operational amplifier (12) having a non-inverting input terminal coupled to a reference voltage. A plurality of capacitors (C1... C63) are selectively connectable in par...
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WO/1994/019763A1 |
A signal processing circuit which provides an accurate continuously tunable impedance. A tunable continuous time transconductor G(s) which may for example comprise an opto-electronic inductor, has a discrete time current processor -H(z) ...
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WO/1992/005637A1 |
A circuit transformation that doubles the effective sampling rate of any switched capacitor oversampled, interpolative modulator, regardless of its order, employs, in each integrator of the modulator, a second input capacitor and switche...
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WO/1991/016764A1 |
A switched capacitor circuit (10) is disclosed having reduced energy consumption. A variable bias (30) supplies an operating current (32) to the switched capacitor circuit (10). When the circuit (10) is not being utilized, the variable b...
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WO/1990/016112A1 |
In a filter, filter input signals (u(t)) are modulated on a carrier signal (p(t)) with a carrier frequency (f¿o?) via a multiplier (M1) and taken to an input (E1) of a SAW convolver (C). A sine-wave signal (v(t)) with a predeterminable ...
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WO/1990/016116A1 |
In order to recognise a predeterminable signal (v(t)) in input signals (u(t)), the latter are taken to a first multiplier (M1) and the predeterminable signal (v(t)) to a second (M2), to the input side of which is applied a carrier signal...
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WO/1990/014712A1 |
A switched capacitor circuit (10) is disclosed having reduced energy consumption. A variable bias (30) supplies an operating current (32) to the switched capacitor circuit (10). When the circuit (10) is not being utilized, the variable b...
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WO/1989/012358A1 |
The converter incorporates a transversal filter. The filter delays are implemented in digital form prior to conversion into analogue signals (preferably using switched capacitor techniques). One form of switched capacitor converter (with...
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WO/1989/006862A1 |
Technology for preventing parasitic capacitance of a MIS-type capacitor. A semiconductor device comprises an n-type semiconductor region (32) formed on a p-type semiconductor substrate (31), and a p-type semiconductor region (34) formed ...
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WO/1989/006069A1 |
A Switched Capacitor circuit implemented by various hardware reduction techniques offering significant savings in chip area and power dissipation. The reduction techniques include Pole Sharing methodologies for multiplexed and unmultiple...
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WO/1989/005983A1 |
A chirped backscatter filter (10) compares a received signal (RSIG) to a reference signal related to a transmitted signal (TSIG) and removes from RSIG the frequency component which is equal to TSIG in frequency. This removed frequency co...
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WO/1989/002192A1 |
A time-multiplexed switched capacitor circuit in which certain capacitors are shared during local time periods of a global time period to allow the total capacitance of the circuit to be reduced. Corresponding savings in chip area in an ...
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WO/1987/003757A1 |
An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter (16') for producing first and second reference signals which have substa...
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WO/1985/004508A1 |
A narrow-band phase shift beamformer system. The outputs from the elements in a transducer array are each divided into two components whose amplitudes are respectively proportional to the sine and cosine of the required phase shift, whic...
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WO/1985/001623A1 |
A switched capacitor biquadratic filter (10, 20) includes means for dynamically shifting the level of the input voltage (VB', VD; VX, VY) of the amplifiers (12, 14) so that the need for a level shifting stage in the amplifiers (12, 14) i...
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WO/1984/001065A1 |
A switched capacitor parasitic insensitive integrator comprises an operational amplifier (6), an integrating capacitor C2, a switched capacitor C, and four switches, two of even phase E1, E2 and two of odd phase 01, 02. In order to minim...
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WO/1983/003326A1 |
A combined phase detector and low pass filter comprises charge storage means (10) which is responsive to an input signal (VI) and which is charged to a level dependent upon the magnitude and phase of the input signal is response to a fir...
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WO/1982/003956A1 |
An operational amplifier (18) capable of selectively performing a variety of circuit functions. A single operational amplifier (18) utilizes switched capacitors (24, 32 and 36) for sampling and holding an input signal VIN, for establishi...
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WO/1982/003957A1 |
An operational amplifier (18) capable of selectively performing a variety of circuit functions. A single operational amplifier (18) utilizes switched capacitors (24, 32 and 36) for sampling and holding an input signal VIN, for establishi...
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WO/1982/003955A1 |
An operational amplifier (18) capable of selectively performing a variety of circuit functions. A single operational amplifier (18) utilizes switched capacitors (24, 32 and 36) for sampling and holding an input signal VIN, for establishi...
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WO/1982/000229A1 |
Sampling filter which employs fractional period displacement of samples to force additional nulls in the filter characteristic response. This sampling method and cascading antialiasing filters (501, 502, 503) provides a filter structure ...
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