Differential amplifier having extended common mode input voltage

Details Differential amplifier having extended common mode input voltage Differential amplifier having extended common mode input voltage

1988-01-21

1989-12-12

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

048870480

ABSTRACT:
A differential amplifier (10) having a circuit (18) which images or simulates the bias current flowing in an input stage (34) of the differential amplifier (10) is disclosed. This image circuit (18) resembles a differential amplifier input stage, couples to the signal inputs (28, 30) of the differential amplifier (10), and provides an output signal that reflects such bias current. One embodiment of the present invention feeds this output signal back to the differential amplifier input stage (34) to improve regulation of a constant current source (26). Another embodiment uses this signal to switch current from an external source (86) to the differential amplifier input stage (34) when a constant current source (26) within the differential amplifier input stage (34) fails to maintain a constant current supply.

REFERENCES:
patent: 4766394 (1988-08-01), Yukawa

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