Class AB output stage wih reduced distortion

Details Class AB output stage wih reduced distortion Class AB output stage wih reduced distortion

1998-01-29

1999-10-05

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330273, 330300, H03F 326, H03F 316

Patent

active

059630930

ABSTRACT:
An output stage of an amplifier circuit includes: a sinking bipolar circuit 23 for sinking current from an external load; a sourcing transistor 14 for sourcing current to the external load, the sourcing transistor 14 coupled in series with the sinking bipolar circuit 23, a common output node 34 is formed between the sourcing transistor 14 and the sinking bipolar circuit 23; a mirroring transistor 16 coupled to the sourcing transistor 14 such that current in the sourcing transistor 14 approximately mirrors current in the mirroring transistor 16; a current mirror circuit 39 responsive to the mirroring transistor 16 and coupled to control current flow through the sinking bipolar circuit 23; and a translinear bias circuit 48 coupled to the sinking bipolar circuit 23 for maintaining a minimum current in the bipolar circuit 23.

REFERENCES:
patent: 4529948 (1985-07-01), Binghan
patent: 5491437 (1996-02-01), Rincon et al.
patent: 5500625 (1996-03-01), Rincon et al.

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