Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Reexamination Certificate
2008-01-29
2008-01-29
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
C330S279000, C330S285000
Reexamination Certificate
active
10526758
ABSTRACT:
A variable-gain amplifier has distortion characteristics (IIP3) improved when the gain is attenuated without impairing characteristics with respect to a gain PG and a noise figure NF when the gain is maximum. The variable-gain amplifier has a plurality of parallel-connected dual-gate FETs having first FETs (6), (8) having gates for being supplied with an input signal and second FETs (7), (9) connected in cascade to the first FETs (6), (8), respectively. Gate control voltages (Vcon1, Vcon2) can separately be applied to the second FETs (7), (9), respectively, from voltage control means.
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Ooya Koichi
Sakuma Tsuyoshi
Lerner David Littenberg Krumholz & Mentlik LLP
Nguyen Hieu
Pascal Robert
Sony Corporation
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