High voltage operational amplifier

Details High voltage operational amplifier High voltage operational amplifier

1982-07-20

1984-06-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330275, 330252, H03F 345, H03F 326

Patent

active

044531346

ABSTRACT:
An operational amplifier is disclosed which is capable of handling input voltages in excess of 200 volts, comprising at least in the input stage thereof a plurality of low voltage transistors including at least a pair of low voltage lateral PNP transistors each having two collectors. These lateral PNP transistors act as level shifters for the amplifier and also a bias arrangement for the input stage. A single high voltage lateral PNP is in the signal path providing the lowest pole in the transfer function and to compensate for low to medium loop gains.

REFERENCES:
patent: 3801923 (1974-04-01), Russell et al.
patent: 4163908 (1979-08-01), Price

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