Class AB CMOS amplifier

Details Class AB CMOS amplifier Class AB CMOS amplifier

1990-07-31

1991-10-15

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330277, H03F 326, H03F 316

Patent

active

050577891

ABSTRACT:
A class AB CMOS amplifier stage is disclosed having well-controlled low quiescent current and good phase stability. A first FET in a complementary push-pull output stage is driven directly by an input signal biased so that such FET conducts a small quiescent current. The second FET in the output stage is driven through a level shifting circuit. The quiescent current in the level-shifting circuit is controlled by a reference voltage. The FETs in the output stage, the level-shifting circuit and the reference-voltage generator are sized with respect to each other to determine the relative magnitudes of quiescent currents and the overall gain of the circuit. The operation of the circuit is essentially independent of process-induced variables and power-supply fluctuations. The FETs in the level-shifting stage can have relatively low impedances for good phase response property.

REFERENCES:
patent: 4800339 (1989-01-01), Tanimoto et al.
patent: 4829266 (1989-05-01), Pernici et al.
patent: 4868518 (1989-09-01), Blanken et al.
patent: 4912425 (1990-03-01), Kobayashi et al.
"A Highly Linear CMOS Buffer Amplifier", by John A. Fisher and Rudolf Koch, IEEE Journal of Solid-State Circuits, vol. sc-22, No. 3, Jun. 1987.
"A High-Performance CMOS Power Amplifier", by John A. Fisher, IEEE Journal of Solid-State Circuits, vol. sc-20, No. 6, Dec. 1985.

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