Correction arrangement for an amplifier

Details Correction arrangement for an amplifier Correction arrangement for an amplifier

1988-06-29

1989-12-19

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330257, 330259, 330264, 330265, H03F 345

Patent

active

048885592

ABSTRACT:
An amplifier includes two differential amplifiers which are connected to an output stage comprising two field effect transistors of opposite conductivity typed directly coupled in series between opposite poles of a DC voltage source. The junction between the two output transistors constitutes the output of the amplifier. A negative feedback loop connects the amplifier's output to the inputs of the differential amplifiers. A correction arrangement is provided to prevent excessive current consumption and cross-over distortion. Preferably, the correction arrangement uses a pair of current mirror circuits to generate respective measuring currents proportional to the current in each of the output transistors. Each such measuring current is compared with a reference current. Any difference between the measuring current and the reference current causes a change in the voltage on the control electrode of the other output transistor, which in turn results in a change in the output voltage and thus a change in the negative feedback applied to both differential amplifiers.

REFERENCES:
patent: 4502020 (1985-02-01), Nelson et al.
patent: 4730168 (1988-03-01), Senderowicz et al.

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