Differential amplifier adapted to be integrated in C-MOS monolit

Details Differential amplifier adapted to be integrated in C-MOS monolit Differential amplifier adapted to be integrated in C-MOS monolit

1994-08-12

1995-11-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330257, H03F 345

Patent

active

054650739

ABSTRACT:
A differential amplifier includes an input stage differential amplifier circuit and an output stage differential amplifier circuit. Differential common-mode output voltages of the output stage differential amplifier circuit are converted into common-mode currents by transistors having sources connected in common. The common-mode currents are taken as input mirror currents of a current mirror circuit. Output mirror currents of the current mirror circuit are supplied to the drain side as output electrode of a constant current transistor of the input stage differential amplifier circuit to form a common-mode feedback circuit. Since the common-mode feedback circuit is constructed only by the common-mode voltage/current converting transistors and the current mirror circuit, the feedback paths can be reduced to establish a transfer function with a single pole for stability of operation of the differential amplifier.

REFERENCES:
patent: 4533876 (1985-08-01), Haque et al.
patent: 4818929 (1989-04-01), Sonntag et al.
patent: 5006817 (1991-04-01), Babanezhad
patent: 5015966 (1991-05-01), McIntyre
patent: 5321370 (1994-06-01), Yukawa
Neues aus der Technik, No. 1, Feb. 20, 1987, p. 1, Chapter "Operational Amplifier" (English language translation also provided).

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