Amplifiers – Modulator-demodulator-type amplifier
Patent
1980-03-25
1981-02-03
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
H03F 338
Patent
active
042491355
ABSTRACT:
An amplifier for a band-limited signal, which produces an amplified output signal by sampling the input signal at a frequency greater than the Nyquist frequency for the signal frequency band, quantizing the signal samples, activating one or more of a plurality of output leads for each quantized sample, actuating switches by the activated quantizer output leads to charge and discharge one or more capacitors in the interval between adjacent samples through windings of an output transformer, and filtering the output of the transformer to produce an amplified quantized replica of the input signal. High power and high efficiency are obtained with moderate voltages and capacitor values, and with available switching devices, for signals with a Nyquist frequency up to several hundred kilohertz.
REFERENCES:
patent: 4153882 (1979-05-01), Fisher et al.
patent: 4162475 (1979-07-01), Fisher et al.
patent: 4178553 (1979-12-01), Fisher et al.
Panter, Modulation, Noise, and Spectral Analysis McGraw-Hill Book Company 1965 pp. 507-547.
Transmission System for Communication, Bell Telephone Laboratories, New York, 1971, pp. 116-122, 142, 566-576.
Sams, Reference Data for Radio Engineers, 1969, pp. 6-10, 6-11, 21-13, 21-14, 29-12.
Flagle, "Variable-Pulse-Width Generator", E.E.E. 11:8, pp. 27, 28.
Fisher Charles B.
Fisher Sidney T.
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