Feedforward amplifier using frequency changeable pilot signal

Details Feedforward amplifier using frequency changeable pilot signal Feedforward amplifier using frequency changeable pilot signal

1994-12-21

1996-10-15

Mottola, Steven

Amplifiers

With pilot frequency control means

330151, H03F 366

Patent

active

055658148

ABSTRACT:
In a first step, a control circuit 61 turns a switch 63 to detect a frequency of an input signal input to an input terminal 1 and distortion generated by amplification of this input signal or mixed in and sets a frequency of a pilot signal output from a variable frequency oscillator 53 at a value other than the input signal frequency and a frequency of the distortion and close to an average value of the input signal. Thereafter, the control circuit 61 turns the switch 63 off and controls a distortion detecting loop 7 by using the pilot signal in a second step and controls a distortion removing loop 4 in a third step. In a fourth step, it succeeds the control of the distortion removing loop 4 in a normal state and controls the distortion detecting loop 7 again only when environment is changed largely.

REFERENCES:
patent: 4885551 (1989-12-01), Myer
patent: 5166634 (1992-11-01), Narahashi et al.
Japanese Patent Application Laid-Open No. HI-198809 (published Aug. 10, 1989).

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