Negative slew rate enhancement circuit for an operational amplif

Details Negative slew rate enhancement circuit for an operational amplif Negative slew rate enhancement circuit for an operational amplif

1993-03-01

1994-07-05

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

053271009

ABSTRACT:
An operational amplifier enhances its negative slew rate by providing more base current to a bottom PNP output drive transistor. A large signal applied at the inverting input of the operational amplifier unbalances the differential input stage and provides maximum current through a current mirror circuit to the base of the PNP output transistor. A transistor is biased on by sufficient current flow through the current mirror circuit to draw even more base current from the base of the PNP output transistor and thereby enhance its negative slew rate.

REFERENCES:
patent: 4232273 (1980-11-01), Leidich
patent: 4922208 (1990-05-01), Susak et al.

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