Large common mode input range CMOS amplifier

Details Large common mode input range CMOS amplifier Large common mode input range CMOS amplifier

1995-06-02

1996-11-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

055744010

ABSTRACT:
A CMOS amplifier input stage including an NMOS differential pair connected in parallel with a PMOS differential pair. Each pair is connected to a tail-current transistor of the same type, and the combined circuits are coupled between positive and negative supply rails. The gates of the tail-current transistors receive the amplifier input signal to provide adaptive biasing of the differential pairs, resulting in a total combined transconductance for both differential pairs which is at least approximately constant with changes in input signal level, thereby enlarging the available common-mode input signal range of the amplifier.

REFERENCES:
patent: 4554515 (1985-11-01), Burson et al.
patent: 4797631 (1989-01-01), Hsu et al.
patent: 5323120 (1994-06-01), Ryat
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5384548 (1995-01-01), Sakurai et al.
"A Rail-to-Rail CMOS Op Amp", J. N. Babanezhad, IEEE Journal of Solid State Circuits, Dec. 1988, vol. 23, No. 6 pp. 1414-1417.
"A Compact Power-Efficient 3V CMOS Rail-to-Rail Input/Output Operational Amplifier for VLSI Cell Libraries", R. Hogervorst et al, IEEE Journal of Solid State Circuits, Dec. 1994, vol. 29, No. 12 pp. 1505-1513.
"Biasing Circuit for High Input Swing Operational Amplifiers" J. F. Duque-Carillo et al, IEEE Journal of Solid State Circuits Feb. 1995, vol. 30, No. 2, pp. 156-159.
"Constant Transconductance CMOS Amplifier Input Stage With Rail-to-Rail Common Mode Input Range", K. Nagaraj, IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, May 1995, vol. 42, No. 5 pp. 366-368.

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