Replica bias circuit to optimize swing of differential op-amp

Details Replica bias circuit to optimize swing of differential op-amp Replica bias circuit to optimize swing of differential op-amp

1997-07-15

1999-01-26

Pascal, Robert J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

058642579

ABSTRACT:
A replica circuit derived from the bias generating circuit for an amplifier. The replica circuit duplicates the operating point of the op-amp transistors, and generates two reference voltages. The average of these two voltages is the optimum common-mode desired output level to maximize differential op-amp swing. Several circuits are disclosed that make use of these two voltages to set the op-amp output to the average of the two voltages.

REFERENCES:
patent: 5212455 (1993-05-01), Pernici et al.
patent: 5565813 (1996-10-01), Connell et al.

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