Self limiting and self biasing operational transconductance ampl

Details Self limiting and self biasing operational transconductance ampl Self limiting and self biasing operational transconductance ampl

1993-10-20

1994-11-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330258, 330311, H03F 345

Patent

active

053610407

ABSTRACT:
An operational transconductance amplifier (38) is coupled to first and second supply voltages (41, 42) for converting differential input signals into a proportional output current. The operational transconductance amplifier (38) has a predetermined common mode input range, and a differential amplifier input stage (28, 29) having a non-inverting input (Vin+), and an inverting input (Vin-). The non-inverting and inverting inputs (Vin+, Vin-) receives differential input signals. Parallel connected transistors (36, 37) are coupled to the differential amplifier input stage (28, 29) for receiving the differential input signals. A current mirror (20-23) has first and second current paths, wherein the first current path sinks a common mode current from the differential amplifier stage, and wherein the second current path diverts the common mode current from the differential amplifier input stage (28, 29) in the event that the differential input signals fall below a predetermined magnitude.

REFERENCES:
patent: 4267517 (1981-05-01), Iida et al.
patent: 4538115 (1985-08-01), Butler
patent: 5128630 (1992-07-01), Mijuskovic
Gregorian and Temes, Analog MOS Integrated Circuits for Signal Processing, High Performance CMOS OP-Amps, 1986, pp. 251-257.

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