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Class Information
Number: 330/302
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including frequency-responsive means in the signal transmission path
Description: Subject matter including frequency-responsive means in the signal transmission path that causes corresponding changes in the amplifier gain.










Sub-classes under this class:

Class Number Class Name Patents
330/306 And bandpass, broadband (e.g., wideband) or sidepass means 358
330/304 And equalizing means 114
330/305 And tuning means 261
330/303 Including an active device in the filter means 127


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
5361043 Delay circuit for changeably delaying an analog signal Nov. 1, 1994
5359294 Charge-balanced switched-capacitor circuit and amplifier circuit using same Oct. 25, 1994
5357213 High-frequency wide band amplifier having reduced impedance Oct. 18, 1994
5339048 Radio frequency amplifier Aug. 16, 1994
5329249 High efficiency RF power amplifier Jul. 12, 1994
5276406 Low noise wide dynamic range amplifiers Jan. 4, 1994
5276404 Constant current video amplifier Jan. 4, 1994
5214395 Parasitic signal suppression circuit for an extremely high frequency oscillator May. 25, 1993
5194826 Circuitry arrangement for the elimination of spurious response in a radio telephone receiver Mar. 16, 1993
5175748 Waveform shaping circuit and receiver using same Dec. 29, 1992
5164683 RF amplifier assembly Nov. 17, 1992
5159287 High efficiency RF power amplifier Oct. 27, 1992
5157351 Insulated gate enhancement mode field effect transistor with slew-rate control on drain output Oct. 20, 1992
5134309 Preamplifier, and waveform shaping circuit incorporating same Jul. 28, 1992
5124668 System for creating distortion in electric musical instruments Jun. 23, 1992
5117203 Phase stable limiting power amplifier May. 26, 1992
5113144 Feed-back type emphasis circuit May. 12, 1992
5053721 High fidelity regenerative amplifier with phase correction circuit Oct. 1, 1991
5023569 Variable gain amplifier Jun. 11, 1991
5015968 Feedback cascode amplifier May. 14, 1991
4994761 VHF power amplifier Feb. 19, 1991
4972512 Circuit for linearly amplifying and demodulating an AM-modulated signal, and integrated semiconductor element for such circuit Nov. 20, 1990
4918402 Delay circuit having at least one all-pass network Apr. 17, 1990
4899115 System for controlling the dynamic range of electric musical instruments Feb. 6, 1990
4890070 Device to control the output power of a class C amplifier Dec. 26, 1989
4890069 Gallium arsenide power monolithic microwave integrated circuit Dec. 26, 1989
4888789 Adjustable equalizer for compensating for high frequency rolloff and typical AM receivers Dec. 19, 1989
4879525 High gain RF amplifier with directional coupler feedback Nov. 7, 1989
4875019 Receiver preamplifier with tuned circuit adapted for Loran reception Oct. 17, 1989
4845441 Amplifier circuit with bipolar transistors Jul. 4, 1989
4839612 High-frequency power amplifier having heterojunction bipolar transistor Jun. 13, 1989
4835485 Unconditionally-stable ultra low noise R.F. preamplifier May. 30, 1989
4833420 Low-pass filter for integrated circuit May. 23, 1989
4779056 Active filter Oct. 18, 1988
4754224 Circuit arrangement for converting an input voltage into a proportional output signal Jun. 28, 1988
4745370 Adjustable phase shift circuit May. 17, 1988
4652835 Gain control bandpass LCR filter with variable bandwidth Mar. 24, 1987
4644292 Automatic gain and frequency characteristic control unit in audio device Feb. 17, 1987
4644295 Balanced differential load and method Feb. 17, 1987
4626881 Capacitor produced of a layer combination of metal, insulator and semiconductor Dec. 2, 1986
4617524 Integrated amplifier circuit having RC network to suppress oscillation Oct. 14, 1986
4613824 Selective amplifier having common base connected transistor and inductive input signal coupling Sep. 23, 1986
4598256 Tuned phase stable limiter amplifier Jul. 1, 1986
4593250 Operational amplifier compensation technique for biquadratic notch active filters Jun. 3, 1986
4591802 Feedback amplifier circuit including cascade connected field effect transistors May. 27, 1986
4588956 Wide band amplifier-limiter device May. 13, 1986
4581587 Solid state electrical musical instrument amplifier Apr. 8, 1986
4581588 Switchable bandpass filter Apr. 8, 1986
4560963 Analog RC active filter Dec. 24, 1985
4559503 Amplifier for correcting group time delay of electrical signals and an intermediate frequency amplifier stage for radio equipment comprising an amplifier of this kind Dec. 17, 1985

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