Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1995-02-14
1998-01-06
Bocure, Tesfaldet
Pulse or digital communications
Transmitters
Antinoise or distortion
375303, 455 84, 455113, H04K 102, H04L 7503
Patent
active
057063109
ABSTRACT:
A digital frequency shift keying (FSK) transmitter provides direct frequency modulation in a wide bandwidth loop. In one embodiment, a discriminator circuit recovers from the output signal of the transmitter a base band signal, which is then compared with the input base band signal to provide an error signal for controlling the output oscillator circuit. In another embodiment, the output oscillator is controlled by a phase detector detecting the phase difference between the base band modulating signal and the output signal of the transmitter. An additional narrow bandwidth loop can be added to compensate for frequency drift in the output oscillator due to temperature or other environmental changes.
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patent: 5323125 (1994-06-01), Hiben
Chao Yen-fang
Hwan Eugene
Wang Han-Chiu
Bocure Tesfaldet
Digital Microwave Corporation
Kwok Edward C.
Webster Bryan
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