Multichannel amplifier with gain matching

Details Multichannel amplifier with gain matching Multichannel amplifier with gain matching

1991-12-05

1992-08-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

330 2, 330 84, 330282, H03G 330, H03F 368

Patent

active

051382806

ABSTRACT:
A multichannel amplifier employs field-effect transistors to vary the gain of operational amplifiers in each respective channel. Gain matching of the respective channels is obtained by providing each channel with a respective DC bias voltage which compensates for differences in pinch-off voltage of the field-effect transistors. The invention permits the use of inexpensive, unmatched JFETs in the amplifier. Close gain tracking achieves very accurate stereo imaging in an audio system.

REFERENCES:
patent: 3914705 (1975-10-01), Takahashi
The Art of Electronics, P. Horowitz and W. Hill, Cambridge University Press, 1980, pp. 122-124.

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