Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
1988-09-19
1989-11-07
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
330307, H03F 368
Patent
active
048795267
ABSTRACT:
A monolithically integrated audio amplifier which is commutable from a stereo configuration to a bridge configuration and vice versa may have only seven pins, namely: two output pins, two input pins, an supply pin, a ground pin and a SVR pin. It comprises two operational amplifiers which may both have two distinct input differential stages, a first input differential stage being fedback according to a stereo configuration while the other input differential stage being fedback according to a bridge configuration of the two operational amplifiers. A comparator with an internally fixed threshold determines, in function of its output state, the switching on or the switching off of one or the other of said two distinct input differential stages of the two operational amplifiers and, therefore, either a stereo configuration or a bridge configuration of the audio amplifier. The input terminal of the comparator may be connected to an input pin or to the SVR pin of the amplifier and a biasing DC voltage level may be imposed thereto through external biasing means for selecting the desired configuration.
REFERENCES:
patent: 4496911 (1985-01-01), Lenz
patent: 4539529 (1985-09-01), Lenz
patent: 4791381 (1988-12-01), Lenz
Botti Edoardo
Torazzina Aldo
Mottola Steven
SGS-Thomson Microelectronics S.R.L.
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