High-frequency amplifier

Details High-frequency amplifier High-frequency amplifier

2007-01-09

2007-01-09

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S307000

Reexamination Certificate

active

10520077

ABSTRACT:
A high frequency amplifier includes a constant voltage driven amplifier1using as its amplifying element a bipolar transistor7with its base biased by a constant voltage, and a constant current driven amplifier2using as its amplifying element a bipolar transistor8with its base biased by a constant current. The idle current of the constant current driven amplifier2is set at a low value. In accordance with the idle current, the idle current of the constant voltage driven amplifier1is adjusted, and the two amplifiers are combined in parallel.

REFERENCES:
patent: 3694765 (1972-09-01), Beurrier
patent: 5903854 (1999-05-01), Abe et al.
patent: 6473595 (2002-10-01), Kim et al.
patent: 6922107 (2005-07-01), Green
patent: 5-110349 (1993-04-01), None
patent: 10-135750 (1998-05-01), None
patent: 2001-284984 (2001-10-01), None
patent: 2003-229728 (2003-08-01), None
Shinato Shinjo, et al., “A 20mA Quiescent Current CV/CC Parallel Operation HBT Power Amplifier for W-CDMA Terminals”, 2002 IEEE Radio Frequency Integrated Circuits Symposium, XP-002365196, Jun. 2, 2002, pp. 249-252.

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