Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2007-06-07
2009-12-29
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S133000
Reexamination Certificate
active
07639080
ABSTRACT:
A bias circuit12includes: a transistor Q5operable to supply, to an amplifier11, a bias current in accordance with a base current supplied thereto; a transistor Q3operable to pass a current in accordance with a reference voltage Vref; a transistor Q2operable to correct, in accordance with the current passed by the transistor Q3, the base current to be supplied to the transistor Q5, so as to compensate a temperature characteristic represented by the transistor Q5; and a bias changing section (of a transistor Q4, and resistances R5, R6, and R7), connected to a base of the transistor Q5, operable to change, in accordance with a control voltage VSW, an amount of the base current to be supplied to the transistor Q5. The amplifier11amplifies, by using the bias current supplied by the bias circuit12, a radio frequency signal having been inputted thereto.
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Motoyoshi Kaname
Nakayama Masao
Oohashi Kazuhiko
Sugiyama Hiroshi
Yamamoto Kouki
McDermott Will & Emery LLP
Nguyen Patricia
Panasonic Corporation
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