Resistorless operational transconductance amplifier circuit

Details Resistorless operational transconductance amplifier circuit Resistorless operational transconductance amplifier circuit

1996-09-04

1998-08-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

330 69, 330 85, 330260, H03F 345

Patent

active

057899738

ABSTRACT:
A resistorless amplifier circuit uses integrated operational transconductance amplifiers to realize a plurality of circuit transfer functions. The preferred embodiment produces an output signal voltage V.sub.out (500) that is either g.sub.m1 /g.sub.m3 or g.sub.m1 /(g.sub.m3 -g.sub.m1) times the input signal voltage V.sub.in (400). Additionally, an alternative embodiment implements a resistorless summing and subtracting operational transconductance amplifier circuit that realizes an output signal voltage as follows: ##EQU1## The resistorless amplifier circuit includes a first operational transconductance amplifier (100) with a transconductance g.sub.m1, a second operational transconductance amplifier (200) with a transconductance g.sub.m2, and a third operational transconductance amplifier (300) with a transconductance g.sub.m3.

REFERENCES:
patent: 4013975 (1977-03-01), Kataoka et al.
patent: 4771196 (1988-09-01), Mead et al.
patent: 4851718 (1989-07-01), Hagino et al.
patent: 5111154 (1992-05-01), Nakagawara
patent: 5345190 (1994-09-01), Kaylor
patent: 5357208 (1994-10-01), Nelson

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