Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-01-03
2006-01-03
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S254000
Reexamination Certificate
active
06982596
ABSTRACT:
In an operational transconductance amplifier (OTA), resistors are bridge-connected to source terminals of MOSFETs that form a differential pair of the OTA. Capacitors are connected in parallel between the resistors in order to remove a DC signal component. The C-R circuit forms a high pass filter in order to intercept the DC component. Accordingly, even if there is a difference in transistor characteristic between the MOSFETs, a DC offset voltage does not appear in differential output terminals of the OTA and an output error can be eliminated. When the OTA is used in an AGC amplifier, an output dynamic range of the AGC amplifier can be made wide owing to the removal of the DC offset voltage.
REFERENCES:
patent: 5384501 (1995-01-01), Koyama et al.
patent: 6316997 (2001-11-01), Tammone, Jr.
patent: 6570447 (2003-05-01), Cyrusian et al.
patent: 2001-60869 (2001-03-01), None
Kizaki Yoshihiro
Kumeta Tomoyuki
Arent & Fox PLLC
Fujitsu Limited
Nguyen Khanh V.
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