Amplifier input stage with charge pump supplying a differential

Details Amplifier input stage with charge pump supplying a differential Amplifier input stage with charge pump supplying a differential

1994-06-23

1995-06-06

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

054226007

ABSTRACT:
An input stage to an amplifier circuit (10) operating with a one volt power supply potential (32) receives a differential input signal. A charge pump (36) increases the one volt power supply potential to 1.8 volts for providing additional head-room for the differential input signal. A current source (44) controls a current mirror (40-42) to draw a predetermined current from the charge pump to supply the active conduction path of a differential transistor pair (12-14). An output stage (34) of the amplifier circuit operates off the one volt power supply potential. Since the charge pump drives only the differential transistor pair through the current mirror, it may be made small to fit on the same integrated circuit as the amplifier including any necessary pump capacitors.

REFERENCES:
patent: 4524328 (1985-06-01), Abou et al.
patent: 4847519 (1989-07-01), Wahl et al.
patent: 5153529 (1992-10-01), Koda et al.
patent: 5212456 (1993-05-01), Kovalcik et al.

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