Active circuit having a temperature stable bias

Details Active circuit having a temperature stable bias Active circuit having a temperature stable bias

1997-09-15

1998-12-29

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

330285, 330289, 330290, 331176, 331177V, H03B 512, H03F 130, H03L 102

Patent

active

058545786

ABSTRACT:
An active circuit includes an amplifying transistor (102), a voltage reference (208), and an active bias circuit. The active bias circuit controls the operating point of the amplifying transistor, and includes a bias transistor (224) which is controlled by the voltage reference and the collector current of the amplifying transistor. As the temperature of the amplifying transistor changes, the tendency of the collector current to change is counter-acted by the bias transistor and the voltage reference.

REFERENCES:
patent: 4122403 (1978-10-01), Cave
patent: 5341112 (1994-08-01), Haman
patent: 5418497 (1995-05-01), Martin
patent: 5532648 (1996-07-01), Culling

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