Low-frequency power amplifier

Details Low-frequency power amplifier Low-frequency power amplifier

1980-08-05

1983-01-18

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, 330207A, H03F 338, H03F 3217

Patent

active

043694098

ABSTRACT:
A compact and inexpensive LF power amplifier is disclosed. A plurality of pulse trains which are phase shifted relative to each other are width-modulated by an input LF signal. The modulated pulse trains are individually amplified, preferably by means of a plurality of respective power transformers and switch elements. The switch elements include any suitable combination of electron tubes and semiconductor switches. The keying ratio of the amplifier is improved by associating the pulse trains in pairs, the two members of each pair being phase shifted 180.degree. relative to each other. The amplified pulse trains are superimposed to form a single combined amplified pulse train.

REFERENCES:
patent: 3899745 (1975-08-01), Fletcher et al.
patent: 4164714 (1979-08-01), Swanson
Funk-Technik, Pulsdauermodulierte AM-Rundfunksender hoher Leistung, 1977, 3 pp.

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