Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1983-09-01
1985-06-18
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, H03F 345
Patent
active
045243301
ABSTRACT:
A bipolar differential amplifying circuit contains a pair of input transistors (3 and 4) for receiving a differential input signal, a pair of differentially-configured first and second transistor circuits (5 and 6) coupled to the input transistors, and a subtracting circuit (11 and 12) for comparing the sum of the currents through first collectors (5C.sub.1 and 6C.sub.1) of the transistor circuits with the current through a second collector (6C.sub.2) of the second transistor circuit to generate an output signal representative of the input signal. A PN diode (13) is coupled to a second collector (5C.sub.2) of the first transistor circuit. The voltages at the collectors are very close, thereby yielding a high common-mode rejection ratio for the input signal.
REFERENCES:
patent: 3538449 (1970-11-01), Solomon
patent: 3801923 (1974-04-01), Russell et al.
patent: 4147944 (1979-04-01), Monticelli
patent: 4228404 (1980-10-01), Widlar
Solomon, "The Monolithic Op Amp: A Tutorial Study", IEEE Journal of Solid-State Circuits, vol. SC-9, No. 9, pp. 314-331, Dec. 1974.
Widlar, "Low Voltage Techniques", IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 838-846.
Briody T. A.
Mayer R. T.
Meetin R. J.
Mullins James B.
Signetics Corporation
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