Bias current supply circuit and amplification circuit

Details Bias current supply circuit and amplification circuit Bias current supply circuit and amplification circuit

2006-03-07

2006-03-07

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

C330S296000

Reexamination Certificate

active

07009453

ABSTRACT:
A bias current supply circuit according to an embodiment of the invention includes a first transistor and a second transistor which form two emitter followers cooperating to supply a base bias current of a bipolar transistor for signal amplification, a normal temperature characteristic circuit which has normal temperature characteristics increasing an amount of current supply with increasing temperature and supplies a base current to the first bipolar transistor, and a reverse temperature characteristic circuit which has reverse temperature characteristics decreasing the amount of current supply with increasing temperature and supplies a base current to the second bipolar transistor.

REFERENCES:
patent: 6052032 (2000-04-01), Jarvinen
patent: 6806775 (2004-10-01), Abe
patent: 6946913 (2005-09-01), Moriwaki et al.

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