Bias circuit and amplifier using the same

Details Bias circuit and amplifier using the same Bias circuit and amplifier using the same

2009-03-16

2010-06-08

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C330S289000

Reexamination Certificate

active

07733186

ABSTRACT:
A bias circuit including: a first current source which generates a first current; a second current source which generates a second current having a temperature-to-output current characteristic that an output current characteristic increases or decreases with a change in temperature to intersect with that of the first current; a first current-voltage conversion circuit which converts the first current to a first voltage; a second current-voltage conversion circuit which has an input terminal and converts a current inputted into the input terminal to a second voltage; a comparison circuit which compares the first voltage and the second voltage and generates a third current according to a result of the comparison; an addition unit which adds the third current to the second current and inputs a resulting current to the input terminal; and a voltage-current conversion circuit which converts the second voltage to a fourth current for bias.

REFERENCES:
patent: 6066987 (2000-05-01), Lorenz
patent: 6809593 (2004-10-01), Newman et al.
patent: 7515000 (2009-04-01), Jin et al.
patent: 7576612 (2009-08-01), Nakamura et al.
patent: 7629851 (2009-12-01), Tsurumaki et al.
patent: 2007-336224 (2007-12-01), None

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