Operational amplifier having stable bias current providing means

Details Operational amplifier having stable bias current providing means Operational amplifier having stable bias current providing means

1990-09-12

1991-09-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330261, 330289, H03F 345

Patent

active

050477307

ABSTRACT:
A bias current supply circuit (20) is provided which includes an initial current source comprising a FET (22) coupled to a current mirror circuit comprising a pair of BJTs (26 and 28). An active resistive element comprising a second FET (24) is included to stabilize an output current I.sub.0 with respect to ambient temperature variations and process variations.

REFERENCES:
patent: 4323854 (1982-04-01), Hester

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