Amplifier with muting circuit

Details Amplifier with muting circuit Amplifier with muting circuit

1980-09-10

1982-12-28

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330254, 330255, 330265, 330267, H03G 334, H03F 330

Patent

active

043664423

ABSTRACT:
An amplifier is disclosed having a differential amplifier circuit, a current mirror circuit, a bias circuit and first and second single ended push-pull (SEPP) circuits connected in parallel to each other between a power source and earth. The first SEPP circuit includes a pair of diode-connected complementary transistors whose emitters are connected together and connected to the amplifier circuit. The second SEPP circuit includes a pair of diode-connected complementary transistors whose emitters are electrically insulated from those of the first SEPP circuit and connected to an output terminal of the amplifier. When a muting switch is opened, the supply of currents to the bias circuit is shut off, causing the first and second SEPP circuits to become unactuated and thereby attenuating an output signal from the output terminal of the amplifier.

REFERENCES:
patent: 3760288 (1973-09-01), Leonard
patent: 3867709 (1975-02-01), Seki et al.
patent: 4176323 (1979-11-01), Odell
patent: 4219781 (1980-08-01), Naokaua

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