Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1984-04-19
1985-11-26
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330252, 330257, H03F 345
Patent
active
045556733
ABSTRACT:
A differential amplifier operable between a pair of supply voltages that define a rail-to-rail supply range contains a pair of differential portions (20 and 22) that together provide representative signal amplification across the supply range, although neither differential portion individually does so. A current control (24) regulates operating currents (I.sub.N and I.sub.p) for the differential portions in such a way that the amplifier transconductance can be controlled in a desired manner as the common-mode part (V.sub.CM) of the amplifier input signal (V.sub.I+ and V.sub.I-) varies across the supply range. The transconductance is typically controlled to be largely constant. A summing circuit (26) selectively combines internal currents (I.sub.A, I.sub.B, I.sub.C, and I.sub.D) from the differential portions to generate at least one output signal (I.sub.O+ and I.sub.O-) representative of the input signal.
REFERENCES:
patent: 4333058 (1982-06-01), Hoover
patent: 4357578 (1982-11-01), Yokoyama
patent: 4377789 (1983-03-01), Hoover
"Linear & Data Acquisition Products", Data Manual, vol. 1, Harris Corp., 1977, pp. 2-59, 2-79.
"Analog: Data Acquisition, Communications, Linear", Data Manual, vol. 3, Harris Corp 1982, pp. 2-29, 2-78.
Huijsing Johan H.
van de Plassche Rudy J.
Briody T. A.
Mayer R.
Meetin R. J.
Mullins James B.
Signetics Corporation
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