Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-08-27
2010-12-07
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000
Reexamination Certificate
active
07847635
ABSTRACT:
Provided is a transconductance amplifier capable of suppressing variation in the range of a linear relationship between an input voltage and an output current depending on the magnitude of a tuning voltage Vctrl, thereby adjusting transconductance over a wider range of operating input voltages. The transconductance amplifier is configured by a differential pair formed of MOS transistors (111, 112) having a common source, MOS transistors (113, 114), amplifiers (106, 107), a voltage generator circuit (100), and a differential-pair input voltage generator circuit (120). An input differential common voltage Vcm of all differential signals inputted to the differential pair is adjusted so that a difference between Vcm and Vctrl is equal to a constant, in accordance with a change in the tuning voltage Vctrl that controls the transconductance. This enables keeping constant the range in which the transconductance amplifier can achieve good linearity.
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Asahi Kasei EMD Corporation
Finnegan Henderson Farabow Garrett & Dunner LLP
Mottola Steven J
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