Amplifiers – Modulator-demodulator-type amplifier
Patent
1987-06-08
1989-05-16
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330124R, 330295, H03F 338, H03F 3189
Patent
active
048313343
ABSTRACT:
A high efficiency envelope amplifier is disclosed. The invention includes a power supply, a comparator and several switches. The power supply is capable of providing multiple outputs. The comparator measures the amplitude of an input signal against one of several threshold levels. When the input signal is within a predetermined range, a selected power supply output is switched incrementally switches small amounts of power, switching losses are substantially mitigated.
REFERENCES:
patent: 3319175 (1967-05-01), Dryden
patent: 4205241 (1980-05-01), Fisher et al.
patent: 4403197 (1983-09-01), Swanson
patent: 4560944 (1985-12-01), Furrer
Patent Abstracts of Japan, vol. 6, No. 60 (E-102) (938), Apr. 17, 1982, & JP, A, 572107 (Pioneer K.K.) Jan. 7, 1982.
Patent Abstracts of Japan, vol. 6, No. 99(E-111) (977), Jun. 8, 1982, & JP, A, 5732104 (Hitachi Seisakusho K.K.) Feb. 20, 1982.
Hudspeth Thomas
Kaplan David S.
Rosen Harold A.
Hughes Aircraft Company
Karambelas A. W.
Meltzer Mark J.
Mitchell Steven M.
Mullins James B.
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