Amplifier having temperature compensated bias control

Details Amplifier having temperature compensated bias control Amplifier having temperature compensated bias control

1993-03-02

1994-08-09

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330267, H03F 326

Patent

active

053370120

ABSTRACT:
An amplifier arrangement which includes a first and a second output transistor each having a base, a collector and an emitter. A bias stage generates a bias voltage between the bases of the first and the second output transistor. The emitters of the first and the second output transistors are coupled to an output terminal. The bias voltage has a negative thermal response, and one element (e.g. a transistor) of the bias stage is thermally coupled to the first and the second output transistor. In order to preclude thermal instability of the amplifier arrangement, the bias stage is adapted to generate a first voltage having a first negative thermal response by means of the one element of the bias stage and to generate a second voltage opposite to the first voltage and having a second negative thermal response. The bias voltage is equal to the sum of the first and the second voltages, the first voltage being larger in absolute value than the second voltage. The negative thermal response of the bias voltage is determined by the effect of the first and the second negative thermal response, and the first negative thermal response is larger in absolute value than the second negative thermal response.

REFERENCES:
patent: 4313082 (1982-01-01), Neidorff

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