Multiplier based transconductance amplifiers and transconductanc

Details Multiplier based transconductance amplifiers and transconductanc Multiplier based transconductance amplifiers and transconductanc

1995-02-02

1996-12-24

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, 330300, 327359, H03F 345

Patent

active

055876870

ABSTRACT:
Multiplier based transconductance amplifiers utilizing the combination of FET differential input stages and Gilbert multiplier output stages are disclosed. The amplifiers provide a high input resistance, high output resistance, and wide g.sub.m adjustment range without need for output level-shifting stages. Also disclosed are various transconductance control circuits which require only a simple one-transistor voltage buffer in the feedback loop rather than the two more complex voltage amplifiers required by the prior art. Various embodiments are disclosed.

REFERENCES:
patent: 3662187 (1972-05-01), Ayres et al.
patent: 5107150 (1992-04-01), Kimura
patent: 5151625 (1992-09-01), Zarabadi et al.
"A BiCMOS Los-Distortion 8-MHz Loss-Pass Filter", Scott D. Willingham, Kenneth W. Martin, A. Ganesan, IEEE Journal of Solid-State Circuits, vol. 28, No. 12, Dec. 1993.

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