Amplifier employing digital modulator circuit

Details Amplifier employing digital modulator circuit Amplifier employing digital modulator circuit

1981-10-26

1983-09-06

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

455108, H03F 338

Patent

active

044031971

ABSTRACT:
An amplifier (FIGS. 1-3) is disclosed for amplifying an amplitude and frequency varying input signal. The amplifier includes a circuit (24, 100) responsive to the input signal to provide a digital representation thereof. In addition, a plurality of signal sources (30-36) are provided which each provide an associated signal. Another circuit (38-52) combines selected ones of the associated signals in accordance with the digital representation to provide a first combined signal having substantially the same waveform as, but of greater amplitude than the input signal.
In several embodiments, a circuit (74, 76-78) provides an error signal in accordance with the difference between the desired and actual forms of the first signal. This error signal is combined with the first combined signal to derive an error corrected signal.

REFERENCES:
patent: 3100851 (1963-08-01), Ross et al.
patent: 3577092 (1971-05-01), Kubicz
patent: 3705391 (1972-12-01), Baker
patent: 3748492 (1973-07-01), Baker
patent: 3867643 (1975-02-01), Baker et al.
patent: 4016501 (1977-04-01), Jasinski et al.
patent: 4153882 (1979-05-01), Fisher et al.
patent: 4164714 (1979-08-01), Swanson
patent: 4205241 (1980-05-01), Fisher et al.

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