| Patents for H03D 7 - Transference of modulation from one carrier to another, e.g. frequency-changing (7,673) |
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| 08/13/1991 | US5039889 Phase comparison circuit |
| 08/06/1991 | US5038404 Low phase noise agile up converter |
| 07/30/1991 | CA1287124C Phase detector for amplitude modulated radio frequency signals containing a low frequency waveform |
| 07/24/1991 | EP0438047A1 Microwave FET |
| 07/23/1991 | US5034994 Single balanced mixer with output filter |
| 07/17/1991 | EP0437194A2 Schottky barrier field effect transistor |
| 07/17/1991 | EP0436861A1 Mixer |
| 07/16/1991 | US5033110 Frequency converter for a radio communications system |
| 07/09/1991 | CA2033380A1 Microwave fet |
| 07/03/1991 | CN1052755A Mixing cascade |
| 06/27/1991 | WO1991009472A1 A method and a device for radio receivers if (intermediate frequency) signal detection |
| 06/26/1991 | EP0434203A2 Cross-coupled mixer stage for zero IF radio |
| 06/25/1991 | US5027430 Outdoor unit low noise converter for satellite broadcast reception use |
| 06/25/1991 | US5027163 High level wide band RF mixer |
| 06/05/1991 | EP0430508A2 Matrixed mixer |
| 06/05/1991 | EP0430480A2 FSK time-delay demodulator with reduced DC-offset |
| 06/05/1991 | EP0429913A2 Mixer stage |
| 05/28/1991 | US5020147 FM/AM broadcast signal converter |
| 05/15/1991 | EP0426812A1 Gallium-arsenide switching mixer. |
| 05/07/1991 | US5014352 Frequency difference detector (FDD) and a carrier modulated receiver including such a FDD |
| 05/07/1991 | US5014349 Television tuner for common use in BS/UV |
| 05/07/1991 | CA1283958C Suspended stripline rat race mixer with simplified i.f. extraction |
| 04/11/1991 | DE3937916C1 Ring mixer with four mixing diodes in bridge circuit - assigns inductance with diode in parallel poled in same direction to each diode in series |
| 04/09/1991 | US5006811 Dual quadrature frequency converter |
| 04/04/1991 | WO1990014150A3 Gallium-arsenide switching mixer |
| 04/03/1991 | EP0420634A2 High level mixer |
| 04/03/1991 | EP0420553A2 Subharmonic mixer |
| 04/03/1991 | EP0420337A1 Balanced hyperfrequency with "balun" circuit |
| 03/21/1991 | WO1991003882A1 Image canceling mixer circuit on an integrated circuit chip |
| 03/19/1991 | US5001773 Local oscillator feedthru cancellation circuit |
| 03/19/1991 | US5001660 Waveform generation method using stored complex data |
| 03/19/1991 | US5001372 Circuitry for making a differential output single-ended |
| 03/14/1991 | DE3929824A1 Two-band frequency converter for SHF range - has preamplifier, diplexer with filter function and local oscillator in two frequency branches |
| 03/13/1991 | EP0416889A2 Frequency mixers |
| 03/05/1991 | CA1281080C Digital zero-if selectivity section |
| 02/27/1991 | EP0414305A2 Phase comparator circuit |
| 02/27/1991 | EP0414114A1 Receiver circuit |
| 02/26/1991 | US4996718 Frequency converter circuit |
| 02/26/1991 | US4996697 Deglitching means for digital communication systems |
| 02/21/1991 | DE3927188A1 Range extending accessory for radio receiver - has tuner between aerial and aerial terminal of receiver, suitable for TV bandwidths |
| 02/21/1991 | DE3927114A1 Microwave range coupler with metal field structures - has conductive structure as combination of fin line and microstrip structure on substrate |
| 02/19/1991 | US4994802 Subscriber unit for wireless digital telephone system |
| 02/19/1991 | US4994755 Active balun |
| 01/30/1991 | EP0245337B1 Frequency doubling oscillator and mixer circuit |
| 01/30/1991 | CN1048958A Channel frequency generator for use with multi-frequency output generator |
| 01/22/1991 | US4987374 FSK demodulator |
| 01/16/1991 | EP0408066A2 Television tuner |
| 01/15/1991 | US4985688 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
| 01/09/1991 | EP0407263A1 Receiving system for TV signals which are retransmitted by satellites |
| 01/09/1991 | EP0406851A2 Station selecting apparatus |
| 01/05/1991 | WO1991000646A1 Receiving system for satellite-transmitted television signals |
| 01/05/1991 | CA2035445A1 System for receiving tv signals transmitted by satellite |
| 12/27/1990 | EP0403661A1 Mixer |
| 12/18/1990 | US4979233 High frequency broad-band mixing circuit including an electrolytic capacitor in parallel with a local oscillator input port |
| 12/18/1990 | US4978873 CMOS analog four-quadrant multiplier |
| 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 |
| 12/13/1990 | DE4018615A1 Frequency converter for quadrature modulator or demodulator |
| 12/13/1990 | DE4018614A1 Frequency converter for quadrature modulator or demodulator |
| 12/12/1990 | EP0401932A1 Receiver for terrestrial AM and satellite FM-TV broadcasting signals |
| 12/12/1990 | EP0401771A2 Circuit arrangement for frequency conversion |
| 12/11/1990 | US4977617 Mixer |
| 12/11/1990 | US4977613 Fine tuning frequency synthesizer with feedback loop for frequency control systems |
| 12/05/1990 | EP0400027A1 Method and apparatus for quadrature modulation. |
| 11/29/1990 | WO1990014711A1 A channel frequency generator for use with a multi-frequency output generator |
| 11/29/1990 | WO1990014150A2 Gallium-arsenide switching mixer |
| 11/22/1990 | EP0398688A2 Procedure for forming frequencies of a digital radio telephone |
| 10/31/1990 | EP0395423A2 Signal generator method and apparatus |
| 10/23/1990 | US4965853 Radio receiver circuit with tuning feedback control for a tunable bandpass filter |
| 10/23/1990 | US4965534 Channel frequency generator for use with a multi-frequency output generator |
| 09/26/1990 | EP0389025A2 Microwave frequency converter |
| 09/19/1990 | CN1045496A Heterodyne stage having precise closed-loop control of amplitude of injection signal thereof |
| 09/12/1990 | CN1009610B Home unit for wireless digital telephone system |
| 09/05/1990 | EP0385181A1 Tuner station selecting apparatus |
| 09/05/1990 | CN1009518B Single side band harmonic frequency converter for high-frequency receiving and transmitting systems |
| 09/04/1990 | US4955085 Series RF/parallel if mixer array |
| 09/04/1990 | US4955079 Waveguide excited enhancement and inherent rejection of interference in a subharmonic mixer |
| 09/04/1990 | US4955078 Frequency difference detector (FDD) having automatic gain control and a carrier modulated receiver including the FDD |
| 09/04/1990 | US4955039 Quadrature receiver |
| 09/04/1990 | US4954790 Enhanced coupled, even mode terminated baluns, and mixers and modulators constructed therefrom |
| 08/28/1990 | US4953182 Gain and phase correction in a dual branch receiver |
| 08/16/1990 | DE3922154A1 Wide band push=pull mixer with strip lines - has second fork-shaped supply network with impedance matching |
| 08/15/1990 | CN1009238B Tv signal frequency transforming circuit |
| 08/14/1990 | US4949398 GaAs MESFET balanced resistive mixer |
| 08/09/1990 | WO1990009061A1 Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof |
| 08/07/1990 | US4947141 Oscillator network for radio receiver |
| 08/07/1990 | US4947062 Double balanced mixing |
| 07/31/1990 | CA1272317A1 Subscriber unit for wireless digital telephone system |
| 07/31/1990 | CA1272248A1 Fm receivers using three-terminal negative admittance networks of two and three-terminal negative admittance networks |
| 07/26/1990 | WO1990008425A1 Mixer |
| 07/24/1990 | US4944025 Direct conversion FM receiver with offset |
| 07/24/1990 | US4943983 Subscriber unit for wireless digital telephone system |
| 07/18/1990 | CN1008869B Anti-interference method for mirrior frequency by mirrior-frequency rejector |
| 07/11/1990 | EP0377519A2 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto |
| 07/11/1990 | CN2059286U Wave guide harmonic mixer |
| 07/05/1990 | DE4006723A1 Wide band double mixer for microwave and MM wave operation - has even number of conductor loops, each of four line branches of different length |
| 06/26/1990 | US4937516 Balanced voltage-current converter and double-balanced mixer circuit comprising such a converter |
| 06/19/1990 | CA1270527A1 Method and apparatus for regulating a single sideband up converter |
| 06/13/1990 | DE3841266A1 Push-pull mixer for the microwave range |
| 06/05/1990 | US4931746 Controllable broadband amplifier and mixer which includes the amplifier |