Acoustic monolithic power semiconductor integrated circuit and a

Details Acoustic monolithic power semiconductor integrated circuit and a Acoustic monolithic power semiconductor integrated circuit and a

1979-10-24

1982-03-23

Cardillo, Jr., Raymond F.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330307, 330252, H03F 300

Patent

active

043214282

ABSTRACT:
An acoustic monolithic IC, which is enabled by a simple modification of the external circuit thereof to realize either the amplification of the left and right channels of stereophonic signals or the application to a balanced transformer-less (BTL) amplifier circuit, is composed of first and second differential amplifier circuits each having non-inverting and inverting inputs and of first and second amplifier output circuits each having non-inverting and inverting inputs.
The first differential amplifier circuit has its non-inverting and inverting inputs led as the first and second input terminals of the acoustic monolithic IC to the outside thereof whereas the second differential amplifier circuit has its non-inverting and inverting inputs led as the third and fourth input terminals of the acoustic monolithic IC to the outside thereof.
The output signals of the first and second differential amplifier circuits are impressed upon the non-inverting inputs of the first and second amplifier output circuits, respectively. The inverting inputs of the first and second amplifier output circuits are led as first and second feedback terminals to the outside of the acoustic monolithic IC so as to determine the gains and output DC levels of those amplifier output circuits.
The output terminals of the first and second amplifier output circuits are led as the first and second output terminals of the acoustic monolithic IC to the outside thereof.

REFERENCES:
patent: 3542953 (1970-11-01), Munch
patent: 3577090 (1971-05-01), Montgomery
patent: 4081757 (1978-03-01), Rumbaugh
IEEE Transactions on Broadcast and TV Receivers, Jul. 1969, pp. 177-185, by Kaplan.
Radio Ternsehen Elektronik, vol. 23, No. 19, pp. 636-637 (1974), by Malessa.

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