Mirror and bias circuit for class AB output stage with large swi

Details Mirror and bias circuit for class AB output stage with large swi Mirror and bias circuit for class AB output stage with large swi

1994-06-09

1995-08-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, H03F 330

Patent

active

054423201

ABSTRACT:
A complementary transistor class AB output stage (200) utilizes a complementary pair of output drivers (220, 222) connected in series between the power supply rails (210, 216) to furnish the stage output. An output driver (206) is a composite pair of transistors in a Darlington configuration, which boosts the current gain and input resistance of the output stage. Bases of the output drivers are connected by a complementary pair of parallel connected drivers (226, 228), which function as common base level shifters. Quiescent bias of the output drivers is achieved by a pair of constant current transistors (232, 238) that are operated as complementary current mirrors. Inputs to the mirrors are relatively low current sink (252) and source (250) supplies. A level shifter and its corresponding current mirror are configured so that base currents flowing therein, which may be variable due to temperature and process variations, are generally shunted away from the current mirrors and toward an output driver to maintain mirrored currents and assist output drive.

REFERENCES:
patent: 4570128 (1986-02-01), Monticelli
patent: 5049653 (1991-09-01), Smith et al.
patent: 5140280 (1992-08-01), Vyne et al.
Robert L. Vyne, Thomas D. Petty, Rikki Koda, and David M. Susak; A Quad Low Voltage Rail-To-Rail Operational Amplifier; IEEE 1992 Bipolar Circuits and Technology Meeting; pp. 242-245.

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