Telecommunications – Transmitter – Carrier frequency stabilization
Patent
1989-08-25
1990-06-12
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Carrier frequency stabilization
455126, 332162, H04B 104
Patent
active
049339869
ABSTRACT:
A gain/phase compensation method and apparatus for a linear amplifier feedback loop in a transmitter (100). The transmitter (100) includes an input (102 or 110), alinear amplifier (143), and a modulator (142), to provide a modulator carrier-frequency output signal. The transmitter also comprises a feedback detector (154), coupled to receive the output signal and also coupled to the input. The feedback detector (120) produces a detected baseband feedback signal and applies the feedback signal to the input. The transmitter (100) of the present invention further comprises stabilizing means (118 and 130), coupled to the input (102 or 110) and to the linear amplifier (143), for reducing the open-loop gain of the linear amplifier (143) to a value lower than one for all frequencies where the feedback loop causes the phase of the baseband input signal to shift by more than 180 degrees.
REFERENCES:
patent: 3914694 (1975-10-01), Shawhan
patent: 4481672 (1984-11-01), Watkinson
patent: 4591800 (1986-05-01), Opas
patent: 4610030 (1986-09-01), Dominguez et al.
patent: 4641105 (1987-02-01), Albaugh et al.
patent: 4696017 (1987-09-01), Masheff et al.
patent: 4724405 (1988-02-01), Matthies et al.
Buchenhorner Michael J.
Eisenzopf Reinhard J.
Faile Andrew
Motorola Inc.
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