Biasing arrangement for a quasi-complementary output stage

Details Biasing arrangement for a quasi-complementary output stage Biasing arrangement for a quasi-complementary output stage

1995-02-21

1996-05-21

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330269, H03F 326, H03F 316

Patent

active

055193579

ABSTRACT:
A biasing arrangement for a quasi-complementary output stage having first and second transistors of a first type, where at least one of the transistors is driven by a third transistor of a second type. The inventive biasing arrangement comprises a first circuit for biasing the third transistor and a second circuit having a third circuit for providing an input signal to the first transistor and a fourth circuit for providing the input signal to the first circuit. In a particular implementation, the first circuit is connected between the input terminals of the first and the third transistors. The third circuit is a fourth transistor having a first terminal connected to a first source of supply, a second terminal connected to a source of the input signal and a third terminal connected to a second source of supply. The third terminal of the fourth transistor is connected to the second source of supply via a first resistor. The fourth circuit is a fifth transistor having a first terminal connected to an input terminal of the third transistor, a second terminal connected to the source of the input signal, and a third terminal connected to the third terminal of the fourth transistor. The inventive arrangement provides a symmetrical output signal with a bias that is stable with temperature.

REFERENCES:
patent: 4524328 (1985-06-01), Abou et al.
patent: 5363063 (1994-11-01), Laot et al.

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