CMOS Amplifier having enhanced current sinking and capacitance l

Details CMOS Amplifier having enhanced current sinking and capacitance l CMOS Amplifier having enhanced current sinking and capacitance l

1988-02-09

1989-07-11

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

048475661

ABSTRACT:
The stability of an amplifier output stage in driving a capacitive load and sinking increasing currents is enhanced by compensating for a reduction in V.sub.BE of a first emitter follower bipolar transistor connected to the amplifier output. This is accomplished by using a second emitter follower transistor with the two emitter follower transistors driving a differential amplifier with the output of the differential amplifier controlling the conductance of a sink MOS transistor connected to the amplifier output. Another MOS transistor is serially connected with the second emitter follower transistor with the gate terminal connected to the differential amplifier output whereby an increasing sinking current causes an increase in current through the second emitter follower transistor and an increase of V.sub.BE of the transistor, thereby increasing V.sub.BE of the first emitter follower transistor.

REFERENCES:
patent: 4720685 (1980-01-01), Garuts

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