Class AB output stage for an audio power amplifier

Details Class AB output stage for an audio power amplifier Class AB output stage for an audio power amplifier

1998-01-29

2000-07-04

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

H03F 330

Patent

active

060844779

ABSTRACT:
An output stage of an amplifier circuit includes a sinking bipolar circuit 22 for sinking current from an external load 12; a sourcing MOS transistor 14 for sourcing current to the external load 12, a source of the MOS transistor 14 coupled to the sinking bipolar circuit 22 to form a common output node 34; a mirroring MOS transistor 16 having a gate coupled to a gate of the sourcing MOS transistor 14 such that current in the sourcing transistor 14 approximately mirrors current in the mirroring transistor 16; and a current mirror circuit 39 responsive to the mirroring transistor 16 and coupled to control current flow through the sinking bipolar circuit 22.

REFERENCES:
patent: 4336503 (1982-06-01), Whatley
patent: 4482868 (1984-11-01), Whatley
patent: 5491448 (1996-02-01), Naokawa et al.
patent: 5703533 (1997-12-01), Nebel et al.

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