Allegretti & Witcoff, Ltd.
Base bias current compensator
 A bias current compensator to supply the input bias current of a transistor. The bias current compensator may be used, for example, with the controlled amplifiers used in an automatic gain control system. The bias current compensator prevents bias current changes, caused by a varying control signal, from appearing in the output of the controlled amplifier. The bias current compensator includes a current source, first, second, and third transistors, and a feedback amplifier. 
Beltone Electronics Corporation
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James R. Richard
Anderson Brander