Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1985-12-27
1987-01-20
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, H03F 345
Patent
active
046382593
ABSTRACT:
An MOS differential input stage circuit (10) includes first (M1) and second (M2) differential input transistors with input nodes at their gates and output nodes at their drains. The sources are connected to a first current source (24). A second pair of differential transistors (M3,M4) which have their sources connected to a second current source (28), their drains connected to a reference voltage node, and their gates common to the respective first differential input transistors, have their bulk regions in common with the bulk regions (20) of the first differential transistors for isolation from supply voltage noise and from common mode input signal effects.
REFERENCES:
patent: 3961279 (1976-06-01), Davis
1983 IEEE International Solid-State Circuits Conference, "Session XVII, Precision Analog Components" T. C. Choi, R. T. Kaneshiro, R. Brodersen, P. Gray, W. Jett and M. Wilcox: ISSCC 83/Friday, 2/25/83, Imperial Ballroom B/11:15 a.m., pp. 246, 247 and 314.
IEEE Journal of Solid-State Circuits, "High-Frequency CMOS Switched-Capacitor Filters for Communications Application" T. Choi, R. T. Kaneshiro, R. W. Brodersen, P. R. Gray, W. Jett and M. Wilcox, vol. sc-18, No. 6, Dec. 1983.
AT&T Bell Laboratories
Mullins James B.
Ulbrich Volker R.
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