Constant transconductance CMOS amplifier input stage with rail-t

Details Constant transconductance CMOS amplifier input stage with rail-t Constant transconductance CMOS amplifier input stage with rail-t

1994-12-27

1996-08-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330261, H03F 345

Patent

active

055505104

ABSTRACT:
A differential amplifier having two complementary differential pairs connected for rail-to-rail common mode input voltage range operation including a constant transconductance maintaining bias circuit is disclosed. The bias circuit provides a fixed rail current bias to a master differential pair and adjusts the bias to the second pair in response to variations in the bias level of the master pair. A unique biasing method and method of operating a differential amplifier are also disclosed.

REFERENCES:
patent: 4555673 (1985-11-01), Huijsing
patent: 4887048 (1989-12-01), Krenik et al.
patent: 5371474 (1994-12-01), Wassenaar et al.
patent: 5384548 (1995-01-01), Sakurai et al.
Duque-Carrillo, J. F., et al., "Constant-Gm Rail-to-Rail Common-Mode Range Input Stage with Minimum CMRR Degradation," IEEE Journal of Solid-State Circuits, vol. 28, No. 6, Jun. 1993, pp. 661-666.
Fisher, J. A., and Koch, R., "A Highly Linear CMOS Buffer Amplifier," IEEE Journal of Solid-State Circuits, vol. SC-22, No. 3, Jun. 1987, pp. 330-334.
Pardoen, M. D., and Dergauwe, M. G. R., "A Rail-to-Rail Input/Output CMOS Power Amplifier," Proc. of the IEEE 1989 Custom Integrated Circuits Conference, San Diego, CA, May 15-18, 1989, pp. 25.5.1-25.5.4.
Wu, W-C. S., et al., "Digital-Compatible High-Performance Operational Amlifier with Rail-to-Rail Input and Output Ranges," IEEE Journal of Solid-State Circuits, vol. 29, No. 1, Jan. 1994, pp. 63-66.

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