Class AB CMOS amplifiers

Details Class AB CMOS amplifiers Class AB CMOS amplifiers

2006-07-18

2006-07-18

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07078971

ABSTRACT:
A class AB output stage of a CMOS amplifier has a level-shifting voltage follower constituted by a level-shifting transistor and a current source. A bias circuit replicates the level-shifting voltage follower in a feedback arrangement to produce a variable bias voltage for the current source of both the main and replica level-shifters. The arrangement serves to control the output voltage of the level-shifter such that it provides the amplifier with a relatively constant quiescent current of the output stage over variations of manufacturing process, supply voltage, and temperature. The level shifting function can be facilitated by a resistive on-state of a power-down transistor between the level-shifting and load transistors.

REFERENCES:
patent: 4912425 (1990-03-01), Kobayashi et al.
patent: 5285168 (1994-02-01), Tomatsu et al.
patent: 6163217 (2000-12-01), Matsubara et al.
patent: 6246288 (2001-06-01), Yamamoto
patent: 6930551 (2005-08-01), Ivanov et al.
“CMOS Switched-Capacitor Filters for a PCM Voice CODEC” by R. Gregorian et al., IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 970-980.
“Introduction To CMOS Op-Amps And Comparators” by R. Gregorian, John Wiley & Sons, 1999, pp. 100-113.

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