Push-pull power amplifier circuit

Details Push-pull power amplifier circuit Push-pull power amplifier circuit

1975-08-28

1977-03-29

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 13, 330 17, 330 22, 330149, H03F 326

Patent

active

040152154

ABSTRACT:
A push-pull power amplifier circuit has a supply voltage ripple removing filter connected to a first amplifier stage which includes a first load circuit. A push-pull output stage is composed of at least an output driver and amplifier portion connected to the supply voltage through a second load circuit and an output amplifier portion driven by the output signal of the output driver and amplifier portion as produced in the second load circuit. The second load circuit is provided as a variable impedance which is controlled by a voltage derived from the supply voltage ripple removing filter to prevent operation of said output amplifier portion prior to operation of said first amplifier stage subsequent to switching on of the power supply so as to avoid a "pop" noise being generated in the output of the amplifier.

REFERENCES:
patent: 3904972 (1975-09-01), Seki et al.

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