Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2008-05-20
2008-05-20
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S069000
Reexamination Certificate
active
11405026
ABSTRACT:
A variable-gain amplifier includes an amplifier stage; an attenuating network receiving an input signal; a plurality of transconductance stages, connected between respective nodes of the attenuating network and the amplifier stage, wherein each of the transconductance stages has a differential circuit, configured to supply differential currents to the amplifier stage; and a gain-control circuit for controlling the transconductance stages according to an electrical control quantity. Each of the transconductance stages further includes a current-divider circuit associated to the differential circuit and controlled by the gain-control circuit so as to divide the differential currents between the amplifier stage and a dispersion line proportionally to the control quantity.
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European Search Report from European Patent Application 05425223.4, filed Apr. 14, 2005.
Chiricosta Mario
Sirito-Olivier Philippe
Choe Henry
Jorgenson Lisa K.
Morris James H.
STMicroelectronics S.r.l.
Wolf Greenfield & Sacks P.C.
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