Gain/phase compensation for linear amplifier feedback loop

Details Gain/phase compensation for linear amplifier feedback loop Gain/phase compensation for linear amplifier feedback loop

H - Electricity

04

B

H04B 1/04 (2006.01) H03G 3/20 (2006.01)

Patent

CA 2063403

2063403 9103108 PCTABS00003 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), a linear amplifier (143), and a modulator (142), to provide a modulated 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.

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