High-dynamics amplifier stage with distortion detection

Details High-dynamics amplifier stage with distortion detection High-dynamics amplifier stage with distortion detection

1988-06-06

1989-07-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 2, 330144, 330149, H03G 320

Patent

active

048497134

ABSTRACT:
In an amplifier stage comprising a pair of input current sources, connected in series between a pair of reference potential lines, a pair of output transistors connected between the pair of reference potential lines and defining an intermediate output terminal of the amplifier, a driving circuit comprising active elements and interposed between the input current source and the output transistors, and at least one saturation control circuit comprising at least one control transistor connected with its base to the driving circuit and with its collector and emitter between the output of the amplifier stage and the intermediate point between the input current sources, to detect distortion due to clipping, at least one distribution detection transistor is provided, connected to the control transistor so as to detect the current flowing through the latter, which current is related to the imbalance of the input current sources and therefore to the distortion generated in the stage.

REFERENCES:
patent: 4048573 (1977-05-01), Evans et al.

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