Patents
Sitemap › H03 - Basic electronic circuitry › H03D - Demodulation or transference of modulation from one carrier to another › H03D 7 - Transference of modulation from one carrier to another, e.g. frequency-changing
Patents for H03D 7 - Transference of modulation from one carrier to another, e.g. frequency-changing (7,673)
05/1990
05/23/1990DE3938671A1 Correcting amplitude and phase faults in direct conversion receiver - multiplying two IF signals with each other and doubling result for obtaining prod. signal
05/23/1990DE3938643A1 Reconstructing lost DC components of IF signals - applying correction signal to each fault-laden IF signal and generating corrected signal
05/22/1990US4928314 Heterodyne stage having precise closed-loop control of the amplitude of the injection signal thereof
05/22/1990CA1269454A1 Transistor mixer
05/22/1990CA1269423A1 Demodulating an angle-modulated signal
05/15/1990US4926500 Frequency converter
05/15/1990US4926443 Correction circuit for a digital quadrature-signal pair
05/02/1990EP0366265A2 Phase detector for amplitude modulated radio frequency signals containing a low frequency waveform
04/1990
04/26/1990DE3918277A1 Push=pull mixer circuitry for wire band operations - has stripline symmetry circuits each with by=pass lines, serving as matching circuits for signal branches
04/18/1990EP0364035A2 Radio receiver circuit arrangement
04/17/1990US4918748 Apparatus and method for phase noise and post tuning drift cancellation
04/10/1990CA1267698A1 Circuitry for multiplying a pcm signal by a sinusoid
04/03/1990US4914380 Signal receiving arrangement
04/03/1990CA1267453A1 Frequency modulation detectors
03/1990
03/28/1990EP0360349A2 Digital frequency generator
03/27/1990US4912773 Communications system utilizing a pilot signal and a modulated signal
03/27/1990US4912520 Mixer circuit for use in a tuner of a television set or the like
03/20/1990US4910801 Integrating coupling circuit for coupling a modulator to a ceramic filter, useful with amplitude modulation receivers
03/20/1990US4910800 Dual branch receiver with wobbled oscillator for distortion reduction
03/08/1990DE3828624A1 121.5/243 MHz emergency receiver concept
02/1990
02/22/1990DE3836143A1 Mixer for transmitting and receiving systems
02/20/1990US4903331 Quadrature detection receiver with separate amplitude and phase control
02/20/1990US4902979 Homodyne down-converter with digital Hilbert transform filtering
02/14/1990EP0354707A2 Frequency converter
02/13/1990CA1265848A1 Method of obtaining a digital signal and a digital difference frequency mixer
01/1990
01/23/1990US4896374 Broadband monolithic balanced mixer apparatus
01/18/1990DE3824016A1 Mischerschaltung fuer niedrige versorgungsspannungen und geringe phasendifferenzen Mixer circuit for low supply voltages and low phase differences
01/17/1990EP0350663A2 Circuit arrangement for the demodulation of a subcarrier
01/10/1990CN1038737A Correction circuit for digital quadrature-signal pair
01/09/1990US4893317 Digital signals and frequency correction in a digital wireless system
01/09/1990US4893316 Digital radio frequency receiver
01/03/1990EP0348877A2 Wristwatch receiver architecture
12/1989
12/27/1989EP0347833A2 Multistage single sideband frequency converter
12/27/1989EP0347761A2 Local oscillator feedthru cancellation circuit and method therefor
12/26/1989US4890301 Arrangement for compensating errors in a quadrature modulator
12/20/1989EP0346986A2 A zero IF receiver
12/20/1989EP0346495A1 Television tuner
12/19/1989US4888558 Phase detector for amplitude modulated radio frequency signals containing a low frequency waveform
12/19/1989US4888557 Digital subharmonic sampling down-converter
12/12/1989US4887052 Tuned oscillator utilizing thin film ferromagnetic resonator
12/12/1989CA1263900A1 Subscriber unit for wireless digital telephone system
12/06/1989EP0344467A1 Quadrature receiver
12/05/1989US4885802 Wristwatch receiver architecture
12/05/1989US4885801 Method and circuit for converting frequency-modulated signals through at least one intermediate frequency into low frequency signals
11/1989
11/30/1989WO1989011756A1 Automatically self-calibrating oscillators in heterodyned radio receivers
11/30/1989DE3903262A1 Receiving system for a satellite broadcasting system
11/29/1989EP0343273A1 Correction circuit for a pair of digital quadrature signals
11/16/1989DE3915418A1 Mixer arrangements
11/15/1989EP0341531A2 Controllable wide band amplifier
11/15/1989EP0144394B1 A receiver system for eliminating self-quieting spurious responses
11/14/1989US4881240 AM equalizer circuit for digital systems
11/14/1989US4881042 Automatically tunable phase locked loop FM detection system
10/1989
10/31/1989US4878253 Planar monolithic millimeter wave mixer
10/31/1989US4878029 Complex digital sampling converter for demodulator
10/25/1989EP0338125A1 Method and apparatus for nulling local oscillator feedthrough
10/24/1989US4876744 Mixer with rat race circuit
10/11/1989EP0336191A1 Circuitry for making a differential output single-ended
09/1989
09/26/1989US4870701 Connecting structure of diodes
09/26/1989CA1261924A1 Digital zero if circuit
09/20/1989EP0333266A2 A direct conversion receiver
09/20/1989CN1035746A Tv signal frequency transforming circuit
09/12/1989US4866449 Multichannel alignment system
09/05/1989US4864644 VHF-UHF mixer having a balun
09/05/1989US4864638 FM receivers using three-terminal negative admittance networks or two and three-terminal negative admittance networks
08/1989
08/23/1989EP0329077A2 SSB mixer in microstrip fashion
08/08/1989US4855894 Frequency converting apparatus
08/08/1989US4855689 Phase lock loop with switchable filter for acquisition and tracking modes
07/1989
07/25/1989US4852123 Nearly DC IF phase locked transceiver
07/19/1989EP0323996A1 Oscillator network and quadrature network for radio receiver
07/18/1989US4850039 Transistor mixer
07/18/1989US4850035 Method and apparatus for regulating a single sideband up converter
07/13/1989WO1989006460A1 Method and apparatus for quadrature modulation
07/04/1989US4845389 Very high frequency mixer
06/1989
06/29/1989WO1989006072A1 Television tuner
06/28/1989EP0322157A1 Active low-pass filter for use with high frequency signal source apparatus
06/28/1989EP0322024A2 Signal receiving arrangement
06/27/1989US4843637 Tuner circuit
06/26/1989EP0305385A4 Digital zero if selectivity section.
06/21/1989EP0321254A1 Dual gate fet mixing apparatus
06/20/1989US4841169 Dual-gate fet amplifier-mixer with intermediate ohmic island for rejecting a frequency band
06/15/1989WO1989005548A1 Receiver
05/1989
05/31/1989EP0318444A1 An arrangement for compensating errors in a quadrature modulator
05/31/1989EP0318306A2 Tuned oscillators
05/31/1989EP0317642A1 Frequency converter circuit
05/30/1989US4835492 Voltage controlled oscillator having constant tuning bias voltage
05/24/1989EP0316999A1 Balanced voltage-current converter and double-balanced mixer circuit comprising such a converter
05/24/1989DE3738262A1 Screened coplanar strip line arrangement
05/17/1989EP0315940A2 Apparatus and method for phase noise and post tuning drift cancellation
05/16/1989US4831661 RF tuning circuit
05/10/1989EP0314753A1 Suspended stripline rat race mixer with simplified i.f. extraction.
05/09/1989US4829204 Mixer having overload protection
05/05/1989WO1989004086A1 Improvements relating to mixer circuits
05/03/1989EP0314208A1 Frequency difference detector (FDD)having automatic gain control and a carrier modulated receiver including the FDD
05/02/1989US4827515 Digital demodulator
04/1989
04/26/1989EP0313126A1 Frequency difference detector (FDD) and a carrier modulated receiver including such a FDD
04/25/1989US4825448 Subscriber unit for wireless digital telephone system
04/18/1989CA1252834A1 Multifunction floating fet circuit
04/11/1989US4821093 Dual channel high electron mobility field effect transistor
03/1989
03/29/1989EP0308520A1 Digital-Demodulator
03/28/1989US4817201 Single side band harmonic frequency converter, in particular for high-frequency receiving and transmitting systems
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