Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-05-16
2006-05-16
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000
Reexamination Certificate
active
07046089
ABSTRACT:
Disclosed is a CMOS variable gain amplifier. The variable gain amplifier comprises a first means for first and second differential input voltages, a second means for controlling its transconductance to generate an output current according to a control voltage, a third means for a bias voltage to generate bias current by current mirror, and to supply a stabilized bias current to the second means using the replica current, and a fourth means for generating an output voltage with a variable gain according to control voltage by its output current generated in the second means. Therefore, the present invention provides a function of controlling low distortion and high linearity in low voltage and a high-speed operation by the supply of a stabilized sharing current bias, and can control a voltage gain in a wide range by the control voltage.
REFERENCES:
patent: 5757230 (1998-05-01), Mangelsdorf
patent: 6657494 (2003-12-01), Twomey
patent: 6710659 (2004-03-01), Teramoto et al.
patent: 4160810 (1992-06-01), None
patent: 7147523 (1995-06-01), None
“A 270 MHz, 1 V pk-pk, Low-Distortion Variable Gain Amplifier in 0.35 um CMOS process”, S. Tan, et al., ESSCIRC 2002, pp. 307-310.
“High Frequency/high dynamic range CMOS VGA”, W.C. Song, et al., Electronics Letters, Jun. 22, 2000, vol. 36, No. 13, pp. 1096-1098.
Cho Gyu Hyung
Kim Jong Dae
Kwon Chong Ki
Park Mun Yang
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Nguyen Khanh V.
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