Amplifier arrangement with improved quiescent current control

Details Amplifier arrangement with improved quiescent current control Amplifier arrangement with improved quiescent current control

1988-03-02

1989-08-15

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, H03F 345

Patent

active

048578614

ABSTRACT:
The first (T.sub.1) and the second (T.sub.2) output transistor of an amplifier arrangement are push-pull driven by means of a drive circuit (10) having two transistors (T.sub.11, T.sub.12) which are each loaded by a current source (T.sub.13, T.sub.14). Currents which are a measure of the currents flowing through the first (T.sub.1) and the second (T.sub.2) output transistor are generated by first (20) and second (30) current measuring means. These currents are applied to a control circuit (40) which controls the current intensity of the current sources (T.sub.13, T.sub.14) in such a way that the harmonic mean value of the currents flowing through the first (T.sub.1) and the second (T.sub.2) output transistor is substantially equal to a reference value.

REFERENCES:
patent: 4746877 (1988-05-01), Siegel

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