Combination driver-summing circuit for rail-to-rail differential

Details Combination driver-summing circuit for rail-to-rail differential Combination driver-summing circuit for rail-to-rail differential

1993-03-25

1994-05-10

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345, H03F 318

Patent

active

053111451

ABSTRACT:
A combination driver/summing circuit for rail-to-rail operation of a differential amplifier includes a differential amplifier input stage that amplifies an input signal and a current control circuit that regulates the operating currents through the active elements of the differential amplifier input stage. A summing circuit divided into first and second segments and supplied with current from a single common floating current source combines internal currents supplied by the differential amplifier input stage. A class A-B driver/output stage is coupled to the summing circuit to derive at least one output signal representative of the input signal and which is operative over nearly the full rail-to-rail supply voltage range.

REFERENCES:
patent: 4555673 (1985-11-01), Huijsing et al.
patent: 4766394 (1988-08-01), Yukawa
patent: 4797631 (1989-01-01), Hsu et al.
patent: 4810339 (1989-01-01), Tanimoto
patent: 4893091 (1990-01-01), Lillis et al.
patent: 4918398 (1990-04-01), Huijsing
patent: 4958133 (1990-09-01), Bazes
J. H. Huising et al in the IEEE JSSC, vol. SC-20, No. 6, Dec. 1985, entitled, "Low Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges".
D. M. Monticelli entitled "A Quad CMOS Single-Supply Op Amp with Rail-to-Rail Output Swing", in the IEEE JSSC, vol. SC-21, No. 6, Dec., 1986.

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