High voltage operational amplifier

Details High voltage operational amplifier High voltage operational amplifier

1996-06-13

1998-04-28

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330292, H03F 345, H03F 114

Patent

active

057450080

ABSTRACT:
A high voltage operational amplifier receives a low voltage differential input signal at a low voltage transconductance stage (3) which provides a differential current output. An intermediate stage (5) has a differential current input coupled to the differential current output of the transconductance stage (3) via a voltage buffer stage (4) and produces a voltage output at a high voltage level but with low voltage swings providing a voltage representing the differential input signal. An interface stage (9) is coupled to receive the voltage output of the intermediate stage (5) and provides voltage and current outputs representing the voltage output of the intermediate stage (5). Output sourcing and sinking stages (6 and 7) receive the voltage and current outputs of the interface stage (9), respectively, and produce high currents representative of the differential input signal. The combination of the high current outputs of the output sourcing and sinking stages (6 and 7) produces a high voltage output signal at the output terminal (8).

REFERENCES:
patent: 5294892 (1994-03-01), Ryat
patent: 5315264 (1994-05-01), Sundby et al.
patent: 5389894 (1995-02-01), Ryat

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