| Patents for H03F 1 - Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements (30,272) |
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| 04/17/1991 | EP0422496A2 DC-coupled transimpedance amplifier |
| 04/16/1991 | US5008632 Temperature compensated feedback circuit for setting and stabilizing amplifier DC bias points |
| 04/16/1991 | US5008586 Solid state current sensing circuit and protection circuit |
| 04/16/1991 | US5008562 Apparatus for generating pulse-like constant current having variable pulse width |
| 04/16/1991 | CA1283177C Bias circuit for fet |
| 04/10/1991 | EP0421601A2 Linearizer for QAM-receiver |
| 04/10/1991 | EP0421533A1 Predistortion apparatus for a digital transmission system |
| 04/10/1991 | EP0421532A1 Predistortion apparatus for a digital transmission system |
| 04/10/1991 | EP0420974A1 Tunable resonance amplifier. |
| 04/10/1991 | CN1050622A Feedback system control device and applications in amplifiers and servomechanisms |
| 04/09/1991 | US5006818 Linear differential amplifier |
| 04/09/1991 | US5006815 Linear-gain amplifier arrangement |
| 04/09/1991 | US5006814 Current amplifier |
| 04/07/1991 | CA2026820A1 Predistortion arrangement for a digital transmission system |
| 04/07/1991 | CA2026819A1 Predistortion arrangement for a digital transmission system |
| 04/03/1991 | EP0420183A2 Push-pull circuit |
| 04/03/1991 | CN1050478A Fet comparator circuitry |
| 04/03/1991 | CN1050475A Offset-volatage-balancing operational amplifier |
| 03/27/1991 | EP0419366A2 Receiver circuit having first and second amplifiers |
| 03/27/1991 | EP0418753A1 Offset voltage compensated operational amplifier |
| 03/26/1991 | US5003271 RF power amplifier system having amplifier protection |
| 03/26/1991 | US5003269 Unity gain amplifier with high slew rate and high bandwidth |
| 03/20/1991 | EP0417985A2 Amplitude stabilized inverting amplifier |
| 03/19/1991 | US5001439 Very low distortion amplifier |
| 03/13/1991 | EP0416622A2 Predistorter for linearization of electronic and optical signals |
| 03/13/1991 | EP0416424A2 Apparatus and method for reducing distortion in an analog optical transmission system |
| 03/13/1991 | EP0293486B1 Amplifier having a constant-current bias circuit |
| 03/13/1991 | CN1049942A Manufacturing method of universally applicable and high-sensitive antenna amplifier |
| 03/12/1991 | US4999585 Circuit technique for cancelling non-linear capacitor-induced harmonic distortion |
| 03/12/1991 | US4999584 Signal-shaping network |
| 03/07/1991 | WO1991003101A1 Darlington transistor circuit |
| 03/07/1991 | CA2024566A1 Apparatus and method for reducing distortion in an analog optical transmission system |
| 03/06/1991 | EP0415503A1 Integrated circuit with detection of the saturation state |
| 03/06/1991 | EP0415313A1 Servo-control arrangement for a feedback system and application to amplifiers and servomechanisms |
| 03/06/1991 | EP0415080A2 Device for converting unbalanced analog electric signals into fully-differential signals |
| 03/06/1991 | EP0415039A2 Electronic circuit for monitoring a final amplifier and its load |
| 03/05/1991 | US4998074 Transistor circuit with base-current compensation |
| 02/27/1991 | EP0414482A2 Bias voltage supplying circuit |
| 02/27/1991 | EP0414328A1 Differential amplifier with capacitive coupling |
| 02/27/1991 | EP0414029A2 Constant-current regulated power circuit |
| 02/26/1991 | US4996529 Auto-zeroing circuit for offset cancellation |
| 02/26/1991 | US4996519 Method and apparatus for monitoring an amplifier |
| 02/26/1991 | US4996501 Amplifier circuit having gain control |
| 02/26/1991 | US4996499 Amplitude stabilized oscillator amplifier |
| 02/21/1991 | WO1991002301A1 Electrical switching circuit |
| 02/21/1991 | DE3926888A1 Darlington-transistorschaltung Darlington transistor circuit |
| 02/20/1991 | EP0413625A1 High efficiency amplifier |
| 02/19/1991 | US4995084 Semiconductor emulation of tube amplifiers |
| 02/19/1991 | US4994761 VHF power amplifier |
| 02/19/1991 | US4994760 Apparatus and method for combining output signals from parallelly coupled power field effect transistors in high frequency amplifiers |
| 02/19/1991 | US4994758 Alpha enhancement of a transistor using base current feedback to the emitter |
| 02/12/1991 | US4993047 Volterra linearizer for digital transmission |
| 02/12/1991 | US4992836 Device for controlling the electrical supply to a load, in a "smart" power integrated circuit |
| 02/12/1991 | US4992757 Differential amplifying circuit |
| 02/12/1991 | US4992755 Transistor circuit |
| 02/12/1991 | US4992754 Predistorter for linearization of electronic and optical signals |
| 02/12/1991 | US4992749 Pulse-width modulating amplifier circuit |
| 02/12/1991 | US4991916 Method and apparatus for automatically biasing a push-pull amplifier |
| 02/12/1991 | CA1280180C Nonlinear signal generating circuit and nonlinear compensating deviceusing the same |
| 02/07/1991 | DE3941350A1 Circuitry improving transfer characteristic of electrolytic capacitor - has further capacitor in parallel which has good properties at higher frequencies and increases useful frequency range |
| 02/07/1991 | DE3925342A1 Class-AB amplifier with single cycle, or push-pull circuit - has FET with current sensing output, which is coupled to constant current source |
| 02/06/1991 | EP0411180A1 Feed forward distortion correction circuit |
| 02/06/1991 | EP0411027A1 Amplifier circuit |
| 02/06/1991 | EP0410988A1 High-gain ic amplifier |
| 02/06/1991 | CN1049065A 电路 Circuit |
| 02/05/1991 | US4990973 Method of producing an MMIC and the integrated circuit produced thereby |
| 01/30/1991 | EP0410536A2 Combined current differencing and operational amplifier circuit |
| 01/30/1991 | EP0410295A2 Single-ended chopper stabilized operational amplifier |
| 01/30/1991 | EP0409844A1 Amplifier arrangement and communication line circuit using same. |
| 01/29/1991 | US4989003 Autozeroed set comparator circuitry |
| 01/29/1991 | US4988954 Low power output stage circuitry in an amplifier |
| 01/29/1991 | US4988953 Amplifiers with effectively zero input capacitance |
| 01/23/1991 | EP0409448A2 Operational amplifier having selectable inputs |
| 01/22/1991 | US4987385 High efficiency power amplifier |
| 01/22/1991 | US4987384 High frequency amplifier |
| 01/22/1991 | US4987381 Tube sound solid-state amplifier |
| 01/22/1991 | US4987378 Feedforward predistortion linearizer |
| 01/22/1991 | US4987377 Field emitter array integrated distributed amplifiers |
| 01/16/1991 | EP0408137A1 Amplifier arrangement |
| 01/16/1991 | EP0407778A2 Hybrid amplifier |
| 01/15/1991 | US4985688 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
| 01/15/1991 | US4985686 Active load impedance control system for radio frequency power amplifiers |
| 01/10/1991 | DE3920802A1 Push=pull amplifier circuit with rest current stabilisation - generates reference signal using control current and control signal derived from amplifier output currents |
| 01/09/1991 | EP0406967A1 Amplifier arrangement |
| 01/09/1991 | EP0406964A1 Amplifier arrangement |
| 01/08/1991 | US4984292 Bandpass amplifier and receiver using bandpass amplifier |
| 01/08/1991 | US4983927 Integrated audio amplifier with combined regulation of the "mute" and "standby" functions and the switching transients |
| 01/02/1991 | EP0405056A2 Output amplifier for the final distribution of television programs |
| 12/31/1990 | WO1991000653A1 Linear transmitter |
| 12/27/1990 | EP0404697A1 Wide band amplifier with constant gain and high frequency selected input impedance |
| 12/27/1990 | EP0404476A2 Comparator circuitry |
| 12/27/1990 | EP0404403A2 Very low distortion amplifier |
| 12/25/1990 | US4980920 Negative impedance driving apparatus having temperature compensation circuit |
| 12/25/1990 | US4980651 High speed, high precision operational amplifier |
| 12/19/1990 | EP0403069A1 Audio amplifier with voltage limiting |
| 12/13/1990 | DE4018617A1 Frequency converter for quadrature modulator or demodulator |
| 12/13/1990 | DE4018616A1 Frequency converter for quadrature modulator or demodulator - using heterodyne signal generator providing quadrature signals with 90 degree phase-shift |
| 12/12/1990 | EP0401869A1 Enhanced-aaccuracy semiconductor power amplifier |
| 12/05/1990 | EP0401013A2 High frequency amplifier circuit capable of optimizing a total power consumption |
| 12/05/1990 | EP0400819A2 Low bias, high slew rate operational amplifier |