Wide range operational amplifier input stage

Details Wide range operational amplifier input stage Wide range operational amplifier input stage

1988-03-03

1989-01-10

Laroche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H03F 345

Patent

active

047976292

ABSTRACT:
A differential input stage for an operational amplifier includes a transistor pair differentially connected and supplied with tail current through a series resistor. The tail current is supplied by a pair of current amplifiers having their outputs coupled to the tail current resistor. The current amplifier inputs are coupled to the bases of the input transistor pair so that they are differentially driven. If the tail current resistor is properly selected the differential output current is a linear function of the differential input voltage. A clamp is provided for the differential input at some relatively large input signal voltage.

REFERENCES:
patent: 4232271 (1980-11-01), Dobkin et al.
patent: 4757273 (1988-07-01), Bray
Signetics, Linear LSI Data and Applications Manual 1985, p. 6-65.

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