High efficiency class AB transconductance amplifier

Details High efficiency class AB transconductance amplifier High efficiency class AB transconductance amplifier

1993-11-04

1994-08-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, 330255, 330257, 330261, 330311, H03F 345

Patent

active

053370074

ABSTRACT:
A class AB transconductance amplifier (200) has first and second differential input amplifier stages (100-112) adapted for receiving first and second differential input signals (Vin+, Vin-). First and second input cascode stages are coupled to the first and second differential input amplifier stages for providing first and second differential folded cascode signals. An output stage (113-118) is coupled to the first and second differential folded cascode signals providing an output signal indicative of a difference between the first and second differential input signals (Vin+, Vin-). A bias stage (101, 102) is coupled to said first and second differential input amplifier stages (103-104, 105-106) and the first and second input cascode stages bias the first and second differential input amplifier stages (100-112) to operate as a class AB folded cascode amplifier circuit (200). The bias stage generates class AB biasing signals.

REFERENCES:
patent: 4958133 (1990-09-01), Bazes
Gregorian and Temes, Analog MOS Integrated Circuits for Signal Processing, High Performance CMOS OP-Amps, 1986, pp. 251-257.

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