Polyphase PDM amplifier

Details Polyphase PDM amplifier Polyphase PDM amplifier

1982-01-25

1984-08-28

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330149, 330251, 330295, H03F 338

Patent

active

044686269

ABSTRACT:
A polyphase PDM amplifier is disclosed including plural parallel PDM amplifier stages (10, 12, 14, 16), all amplifying the same input signal. The PDM amplifier outputs are combined to produce a combined amplifier output. The various PDM amplifier stages modulate PDM carrier signals of like frequencies but differing phases. Capacitors (40, 42, 44, 46) are connected from each amplifier output to a common circuit node (48). These capacitors reduce the amplitudes of the spurious, out-of-phase components in the amplifier outputs which are introduced by the PDM modulation-demodulation process.

REFERENCES:
patent: 3022465 (1962-02-01), Slenker et al.
patent: 3153203 (1964-10-01), Sem-Jacobsen et al.
patent: 3290617 (1966-12-01), Bellum
patent: 3328710 (1967-06-01), Baldwin
patent: 3386041 (1968-05-01), Bell
patent: 3500066 (1970-03-01), Pritchett
patent: 3585517 (1971-06-01), Herbert
patent: 4164714 (1979-08-01), Swanson
Hager, Wolfgang and Rudolph, Klaus, "A Simple Trasistorized RF PWR AMP-etc.", Nuclear Inst. and Methods, Sep. 15, 1975, p. 167.

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