Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1979-07-05
1981-06-02
Dixon, Harold A.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, H03F 345
Patent
active
042713943
ABSTRACT:
An amplifier including two long-tailed-pair configurations in cascade: the first including a pair of bipolar transistors having input signals coupled to their respective bases, their emitters connected to a source of quiescent operating current, and their collectors connected to respective constant current generator loads; and the second including a pair of field-effect transistors having gate electrodes coupled to receive signals from the respective collectors of the first and second bipolar transistors, their source electrodes connected to a source of quiescent operating current, and their drain electrodes connected to subsequent circuit means for deriving an output from at least one of them. By this arrangement substantially the maximum available voltage gain is obtained from the first long-tailed pair. The amplifier may be used as the input circuitry of an operational amplifier, for example, and is suitable for monolithic construction.
REFERENCES:
patent: 3440554 (1969-04-01), McGraw et al.
patent: 3444476 (1969-05-01), Leidich
patent: 3614645 (1971-10-01), Wheatley
patent: 3644838 (1972-02-01), Graf
patent: 3757239 (1973-09-01), Langan
patent: 3922614 (1975-11-01), van de Plassche
patent: 3953807 (1976-04-01), Schade
patent: 3959733 (1976-05-01), Solomon et al.
patent: 4007427 (1977-02-01), Leidich
Operational Amplifiers by Graeme et al., 1971 McGraw-Hill Book Co. pp. 38-45.
Linear Integrated Circuit D.A.T.A. Book Edition 21 p. 174.
RCA Integrated Circuit DATA Book, 1976 pp. 280, 281.
Berard Jr. Clement A.
Dixon Harold A.
Emanuel P. M.
Rasmussen P. J.
RCA Corporation
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