| Patents for H03B 21 - Generation of oscillations by combining unmodulated signals of different frequencies (1,067) |
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| 03/05/1996 | US5497128 Local oscillator system and frequency switching method for minimizing spurious components |
| 02/27/1996 | US5495202 High spectral purity digital waveform synthesizer |
| 01/10/1996 | EP0691733A2 Frequency converting circuit |
| 11/28/1995 | CA2048148C Transmitter |
| 11/07/1995 | US5465414 Automatic determination of the presence of a microwave signal and whether the signal is CW or pulsed |
| 08/08/1995 | US5440275 Marker sweep linearization system and method |
| 07/25/1995 | US5436600 MRI multi-frequency DSB and SSB RF synthesizer |
| 04/25/1995 | US5410747 Dual conversion transmitter |
| 04/19/1995 | CN2195162Y HF stability power synthesizer |
| 04/18/1995 | US5408201 Frequency synthesizer using three subfrequency synthesizers for generating two different frequencies |
| 01/17/1995 | US5382913 Method and apparatus for generating two phase-coherent signals with arbitrary frequency ratio |
| 01/04/1995 | EP0632574A1 High spectral purity digital waveform synthesizer |
| 01/03/1995 | US5379346 Cascading synchronized chaotic systems |
| 12/31/1994 | CA2126578A1 High spectral purity digital waveform synthesizer |
| 08/24/1994 | CN1091230A Inverse difference frequency synthesis method for superwide band voltage tunable oscillator |
| 08/03/1994 | CN1090449A Power saving frequency synthesizer with fast pull-in feature |
| 06/15/1994 | EP0569440A4 Cell-site simulator for mobile communication systems |
| 04/13/1994 | EP0592190A2 Local oscillator and its frequency switching method |
| 02/23/1994 | EP0583804A1 A phase locked loop circuit |
| 02/23/1994 | EP0583802A1 A signal generator suitable for use in a frequency synthesizer |
| 02/23/1994 | EP0583801A1 A phase locked loop circuit including a frequency detection function |
| 02/23/1994 | EP0583800A1 A voltage controlled oscillator |
| 01/18/1994 | US5280290 Self-oscillating mixer circuits, and FMCW radar |
| 01/04/1994 | US5276904 Antenna system |
| 12/15/1993 | EP0573926A1 Wideband, low noise microwave signal generator |
| 12/08/1993 | CA2097652A1 Wideband, low noise microwave signal generator |
| 11/30/1993 | US5267182 Method to generate an output frequency |
| 11/18/1993 | EP0569440A1 Cell-site simulator for mobile communication systems |
| 10/19/1993 | US5254955 Advanced phase locked loop circuit |
| 07/06/1993 | US5225840 Wideband, low noise microwave signal generator |
| 06/15/1993 | US5220680 Frequency signal generator apparatus and method for simulating interference in mobile communication systems |
| 06/08/1993 | US5218313 Frequency synthesizer for implementing generator of highly pure signals and circuit devices, such as VCO, PLL and SG used therein |
| 05/26/1993 | EP0543431A1 Self-oscillating mixer circuits, and FMCW radar |
| 01/20/1993 | EP0523938A1 A radio receiver |
| 01/12/1993 | US5179729 Tuner station selecting apparatus |
| 01/12/1993 | US5179359 Digitally controlled frequency generator including a crystal oscillator |
| 11/25/1992 | EP0515074A2 Frequency controlled oscillator for high frequency phase-locked loop |
| 11/24/1992 | US5166629 Direct frequency synthesizer |
| 11/03/1992 | US5160902 Voltage controlled oscillator with controlled capacitance ratio in positive feedback loop to broaden bandwidth |
| 10/15/1992 | DE4111920A1 Millimetre wavelength frequency division e.g. for vehicle sensing system - using auxiliary oscillator, N-harmonic mixer and frequency divider to produce N-divided frequency |
| 10/15/1992 | DE4111919A1 Millimetre wavelength frequency division for LF prodn. - using feedback loop with frequency divider, harmonic generator and N-harmonic mixer to achieve required frequency |
| 09/09/1992 | EP0502449A1 Frequency converter |
| 08/12/1992 | EP0498013A1 Circuit arrangement for generating a clock signal with a phase calculating unit |
| 07/21/1992 | US5132633 PLL using a multi-phase frequency correction circuit in place of a VCO |
| 07/16/1992 | WO1992013391A1 Cell-site simulator for mobile communication systems |
| 07/16/1992 | CA2100460A1 Cell-site simulator for mobile communication systems |
| 06/16/1992 | US5122763 Frequency snythesizer for implementing generator of highly pure signals and circuit devices, such as vcq, bll and sg, used therein |
| 06/16/1992 | US5122757 Digital frequency generator |
| 06/16/1992 | CA1303687C2 Subscriber unit for wireless digital telephone system |
| 03/17/1992 | CA1297544C Method of and apparatus for digitally setting a control frequency |
| 02/05/1992 | EP0469898A2 Transmitter with dual conversion |
| 01/07/1992 | CA1294005C Apparatus and method for phase noise and post tuning drift cancellation |
| 11/14/1991 | DE4105338A1 High frequency oscillator using surface wave resonator reference - mixes surface wave resonator output with auxiliary oscillator and filters required frequency |
| 11/05/1991 | US5063361 Serrodyne modulator |
| 09/03/1991 | US5045799 Peak to average power ratio reduction in a power amplifier with multiple carrier input |
| 04/02/1991 | US5005114 Circuitry for generating phase-shifted sinusoidal voltages |
| 02/27/1991 | EP0414260A2 Frequency synthesizer for implementing generator of highly pure signals and circuit devices, such as VCO, PLL and SG, used therein |
| 01/09/1991 | EP0407263A1 Receiving system for TV signals which are retransmitted by satellites |
| 01/05/1991 | WO1991000646A1 Receiving system for satellite-transmitted television signals |
| 01/05/1991 | CA2035445A1 System for receiving tv signals transmitted by satellite |
| 01/01/1991 | US4982165 Set-on oscillator |
| 09/05/1990 | EP0385181A1 Tuner station selecting apparatus |
| 07/24/1990 | US4944025 Direct conversion FM receiver with offset |
| 07/10/1990 | US4940950 Frequency synthesis method and apparatus using approximation to provide closely spaced discrete frequencies over a wide range with rapid acquisition |
| 05/23/1990 | EP0369102A2 Modulation method and arrangement for carrying out the method |
| 05/15/1990 | US4926130 Synchronous up-conversion direct digital synthesizer |
| 04/17/1990 | US4918748 Apparatus and method for phase noise and post tuning drift cancellation |
| 03/28/1990 | EP0360349A2 Digital frequency generator |
| 02/15/1990 | DE3826882A1 Device for generating a wave shape having a discrete frequency spectrum |
| 11/02/1989 | EP0339381A1 Circuit arrangement for the generation of a dephased sine wave voltage |
| 10/31/1989 | US4878027 Direct frequency synthesizer using powers of two synthesis techniques |
| 09/19/1989 | US4868510 Device for fixing the phase of frequency synthesizer outputs |
| 08/22/1989 | US4859968 Frequency generator |
| 08/08/1989 | US4855895 Frequency dividing apparatus for high frequency |
| 07/25/1989 | US4851783 Method of and apparatus for digitally setting a control frequency |
| 05/17/1989 | EP0315940A2 Apparatus and method for phase noise and post tuning drift cancellation |
| 12/13/1988 | US4791377 Direct frequency synthesizer |
| 11/23/1988 | EP0292002A2 Frequency dividing apparatus for high frequency |
| 10/19/1988 | EP0287053A2 Method and circuit arrangement for the digital tuning of a control frequency |
| 10/04/1988 | US4775805 Differential frequency signal generator |
| 07/06/1988 | EP0273203A1 Frequency synthesizer |
| 05/17/1988 | US4745373 Method and structure for synthesizing 2C Hz from A 2A.5B Hz oscillator |
| 04/19/1988 | US4739279 Method and a device for rapid adjustment of the phase of a clock signal in rapid phase |
| 03/23/1988 | EP0260378A2 Modulation method |
| 02/16/1988 | US4725786 Full-octave direct frequency synthesizer |
| 12/23/1987 | EP0249733A1 Frequency synthesizer |
| 12/01/1987 | US4710890 For multiplying a first and second signal and forming a product |
| 11/17/1987 | US4707665 Low noise signal generator |
| 09/30/1987 | EP0238710A2 Frequency synthesizer |
| 09/22/1987 | US4695940 Dynamic frequency divider with a mixer stage and an amplifier |
| 08/19/1987 | EP0116084B1 Low noise microwave frequency synthesizer |
| 08/04/1987 | US4684902 Radio frequency signal generator |
| 07/28/1987 | US4683437 For developing an output signal |
| 07/21/1987 | CA1224570A1 Complex microwave signal generator |
| 06/02/1987 | US4670674 Analog and aperiodic frequency divide-by-two circuit |
| 04/22/1987 | EP0219338A2 Digital color signal processing circuit |
| 04/21/1987 | US4659999 Direct frequency synthesizer which is step-wise variable and has phase continuity and phase reproducibility when switching frequencies |
| 04/02/1987 | DE3533104A1 Frequency divider with a mixing stage |
| 03/04/1987 | CN85205070U Multi-end mixer |
| 03/03/1987 | US4648060 Dual channel frequency synthesizer system |