Negative feedback CMOS differential amplifier operating in commo

Details Negative feedback CMOS differential amplifier operating in commo Negative feedback CMOS differential amplifier operating in commo

1993-07-30

1994-06-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

053193164

ABSTRACT:
In a CMOS amplifier having a differential input and differential output, the input stage includes two legs, each of which includes an input transistor. A common mode negative feedback stage includes a load connected to the high supply voltage, a first transistor connected between the load and a common terminal of the input transistors. The first transistor is biased to the desired common mode voltage. A second transistor is connected between the load and the low supply voltage, and has a gate connected to a voltage corresponding to the means voltage of the output stage. An additional transistor is disposed in parallel with each input transistor. Each additional transistor has its gate connected to the desired common mode voltage.

REFERENCES:
patent: 4213098 (1980-07-01), Tsividis
patent: 4533876 (1985-08-01), Haque et al.
patent: 4573020 (1986-02-01), Whatley
patent: 4697152 (1987-09-01), Westwick
patent: 4992755 (1991-02-01), Seevinck et al.
patent: 4996498 (1991-02-01), Hanna
IEEE Journal of Solid-State Circuits, vol. 25, No. 2, Apr. 1991, New York, pp. 546-554, Tomasini et al., "A Fully Differential CMOS Line Driver for ISDN".
IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, New York, pp. 1414-1425, Batruni et al., "Mixed Digital/Analog Signal Processing for a Single-Chip 2B1Q U-Interface Transceiver".

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