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Class Information
Number: 330/107
Name: Amplifiers > Signal feedback > Phase shift means in loop path
Description: Subject matter wherein the "loop path" (see (3) Note under subclass 75 for the definition of loop path) includes voltage or current phase shift or delay means which may shift the phase of the voltage or current of one signal frequency or signal frequency feedback component with respect to another or shift the phase of the voltage of the signal or signal feedback with respect to the current.










Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
4866397 Wideband 0-90 degrees adjustable phase shifter Sep. 12, 1989
4862121 Switched capacitor filter Aug. 29, 1989
4857860 Clock-sweepable low-pass filter having DC gain accuracy and reduced DC offset Aug. 15, 1989
4853651 Delay circuit with all-pass network Aug. 1, 1989
4849709 Variable frequency characteristic circuit for a vehicular sound device Jul. 18, 1989
4841179 Phase equalizing active filter Jun. 20, 1989
4835482 Semiconductor integrated circuit forming a switched capacitor filter May. 30, 1989
4833420 Low-pass filter for integrated circuit May. 23, 1989
4806874 Switched capacitor amplifier circuit Feb. 21, 1989
4805126 Electronic compensation network Feb. 14, 1989
4803382 Voltage comparator circuit Feb. 7, 1989
4801888 Programmable, universal filter with self biasing Jan. 31, 1989
4795987 Parasitic insensitive switched capacitor filter Jan. 3, 1989
4783635 Low pass filter circuit Nov. 8, 1988
4782305 Differential input-single output two pole filter implemented by a single amplifier Nov. 1, 1988
4779056 Active filter Oct. 18, 1988
4767998 Active filter using low gain amplification stages Aug. 30, 1988
4763081 Reducing distortion in active MOSFET-C low pass filters Aug. 9, 1988
4760346 Switched capacitor summing amplifier Jul. 26, 1988
4755771 Equalizing circuit Jul. 5, 1988
4751562 Field-effect semiconductor device Jun. 14, 1988
4749852 Image sensor driving circuit Jun. 7, 1988
4713627 Active filter with bootstrapping Dec. 15, 1987
4710726 Semiconductive MOS resistance network Dec. 1, 1987
4697152 Fully differential switched capacitor amplifier having autozeroed common-mode feedback Sep. 29, 1987
4686486 Active filter having series resonant active filter terminated by parallel resonant active filter Aug. 11, 1987
4683441 Apparatus for establishing the differences between multiple pairs of analog input signals Jul. 28, 1987
4675616 Second order all pass network Jun. 23, 1987
4663597 RC coupling filter, especially an input filter, for receivers of centralized ripple control systems May. 5, 1987
4656429 Voltage comparison circuit with ripple component elimination Apr. 7, 1987
4647865 Parasitic insensitive switched capacitor input structure for a fully differential operational amplifier Mar. 3, 1987
4644304 Switched-capacitor pseudo-n-path filter Feb. 17, 1987
4644306 Programmable electronic synthesized capacitance Feb. 17, 1987
4636738 Parasitic compensated switched capacitor integrator Jan. 13, 1987
4633189 NF tone control circuit Dec. 30, 1986
4607231 Variable switched-capacitor filter capable of changing the filter characteristic thereof Aug. 19, 1986
4604584 Switched capacitor precision difference amplifier Aug. 5, 1986
4599573 Switched capacitor filter utilizing a differential input and output circuit and method Jul. 8, 1986
4593250 Operational amplifier compensation technique for biquadratic notch active filters Jun. 3, 1986
RE32132 Video signal play-back circuit Apr. 29, 1986
4581587 Solid state electrical musical instrument amplifier Apr. 8, 1986
4581588 Switchable bandpass filter Apr. 8, 1986
4580103 Amplifier circuit arrangement for eliminating input signal offset in the output Apr. 1, 1986
4563652 Dual-stage filter with feedback Jan. 7, 1986
4559498 Symmetrical integrator and application of said integrator to an electric filter Dec. 17, 1985
4555668 Gain amplifier Nov. 26, 1985
4553103 RC-Active filters Nov. 12, 1985
4551683 Switched capacitor filter circuit Nov. 5, 1985
4551686 Coupling filter, especially an input filter, for receivers of centralized ripple control systems Nov. 5, 1985
4543536 Charge amplifier with automatic zero Sep. 24, 1985

1 2 3 4 5 6 7 8 9










 
 
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