Common mode stabilizing circuit and method

Details Common mode stabilizing circuit and method Common mode stabilizing circuit and method

1996-01-11

1997-09-16

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

327 53, 330257, 330258, G05F 316

Patent

active

056684681

ABSTRACT:
A circuit and method for stabilizing a common mode voltage in a differential circuit provides a desired common mode voltage V.sub.cm to control terminals of two transistors which provide the variable resistance for setting the common mode voltage. V.sub.cm is sampled between load resistors R.sub.L connecting operating terminals of the two transistors and applied directly to their control terminals. A known common mode current I.sub.cm is accepted by each transistor, leaving a differential current I.sub.d to flow through load resistors R.sub.L. The circuit and method find application in a variety of uses, including transconductance and transresistance amplifiers and automatic gain control circuits.

REFERENCES:
patent: 4446419 (1984-05-01), Van De Plassche et al.
patent: 4560921 (1985-12-01), Yamatake

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