Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1980-02-28
1982-08-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
307492, 307499, 330257, 330258, 330288, H03F 345, G06G 724
Patent
active
043452132
ABSTRACT:
A differential-input amplifier suitable for the input stage of a CMOS operational amplifier has the capability of amplifying input signals with common-mode voltage components in a range including the entirety of its operating voltage. To provide this capability for one end of the common-mode range a long-tailed pair connection of depletion-mode field effect transistors with gates at the inverting and non-inverting input terminals of the amplifier is used; and to provide this capability for the other end of the common-mode range the substrates of the transistors are biased to operate them in effect as enhancement-mode transistors allowing their drains to work into a current mirror amplifier used for converting their balanced drain variations to single-ended form. Current mirror amplifier configurations are disclosed which are preferable for such conversion since they operate with reduced potential requirements, but are integrable in CMOS.
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"L120 Dual Differential Input Amplifier", Electronic Design, vol. 21, No. 4, Feb. 15, 1973, p. A9.
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Intersil, Data Sheet for ICL761X etc., Low Power MAXMOS Operational Amplifiers, 1976.
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Berard Jr. Clement A.
Mullins James B.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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