Audio amplifier for integrated circuit fabrication having contro

Details Audio amplifier for integrated circuit fabrication having contro Audio amplifier for integrated circuit fabrication having contro

1975-06-26

1977-05-24

Rolinec, Rudolph V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 15, 330 17, 330 28, 330 30D, H03F 304

Patent

active

040258718

ABSTRACT:
An audio amplifier is described designed for integrated circuit fabrication and having controlled idling current. The amplifier includes a pre-amplifier designed to be driven from an AM or FM detector or a high impedance ceramic cartridge. The powder amplifier has a pair of like conductivity type output transistors connected in push-pull and driven by a novel interstage driver whose circuit configuration and component parameters are selected to reduce the idling current to a small predictable value. Measures are further provided, including two feedback paths, for insuring stability, minimizing distortion and hum. The amplifier is executed in an integrated circuit format with a minimum of outboarded components and a minimum "pad" requirement.

REFERENCES:
patent: 3416092 (1968-12-01), Frederiksen
patent: 3462698 (1969-08-01), Yagher, Jr.
patent: 3569849 (1971-03-01), Cassidy
patent: 3870965 (1975-03-01), Frederiksen
patent: 3914703 (1975-10-01), Stauffer
patent: 3916331 (1975-10-01), Schenck

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