Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2011-07-12
2011-07-12
Choe, Henry K (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S297000
Reexamination Certificate
active
07978008
ABSTRACT:
A supply voltage control device for an amplifier that controls a supply voltage for the amplifier has been improved. The supply voltage control device includes: a supply voltage control circuit including an error amplification circuit that feeds an error current so as to control the supply voltage for the amplifier, and a direct current feed circuit that feeds a direct current (or the direct current and a current of a low-frequency component); a high-frequency component extraction unit that extracts a predetermined high-frequency component contained in a signal resulting from detection of an envelope relevant to a signal to be amplified by the amplifier; a peak hold unit that performs peak hold processing on a signal of the extracted high-frequency component; and an addition unit that adds up a signal based on the result of detection of the envelope relevant to the signal to be amplified by the amplifier, and the signal resulting from the peak hold processing, and inputs a signal resulting from the addition to the supply voltage control circuit.
REFERENCES:
patent: 5182524 (1993-01-01), Hopkins
patent: 7026868 (2006-04-01), Robinson et al.
patent: 7696818 (2010-04-01), Kunihiro et al.
patent: 2003/0053552 (2003-03-01), Hongo et al.
patent: 2003-92518 (2003-03-01), None
Ito Keiju
Miura Susumu
Choe Henry K
Hitachi Kokusai Electric Inc.
Wenderoth , Lind & Ponack, L.L.P.
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