Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1991-09-06
1992-12-15
Mottola, Steven
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330151, H03F 126
Patent
active
051720728
ABSTRACT:
A high efficiency harmonic injection power amplifier has a power amplifier circuit, and at least a second-harmonic termination circuit which is coupled in parallel with the power amplifier circuit so to sample a small portion of the input signal and to inject into the power output signal an amplified harmonic signal which is phase-shifted for proper harmonic termination. The second-harmonic termination circuit includes a frequency multiplier for multiplying the frequency of the sampled input signal to twice the fundamental frequency, i.e., to 2f.sub.o, an amplifier for amplifying the 2f.sub.o signal to the level of the corresponding harmonic component of the power amplifier output signal, and a phase shifter for shifting the phase of the second-harmonic signal for proper harmonic termination. Additional harmonic termination circuits may be provided for terminating third- and higher-order harmonics.
REFERENCES:
patent: 4394624 (1983-07-01), Bauman
patent: 4531098 (1985-07-01), Reed
Bahl Inder J.
Griffin Edward L.
Pollman Michael D.
Willems David A.
ITT Corporation
Mottola Steven
Plevy Arthur L.
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