Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-10-24
2006-10-24
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000
Reexamination Certificate
active
07126425
ABSTRACT:
A common mode voltage detection circuit105detects a common mode voltage VCM from differential output terminals of a differential output circuit101. The common mode voltage detection circuit outputs a detected voltage VCM2in accordance with the common mode voltage VCM. An OTA106in the common mode feedback loop inputs or outputs multiple currents of the same phase in accordance with a voltage difference between a reference voltage VCM1and the detected voltage VCM2. The respective multiple currents of the same phase are inputted/outputted to/from the two respective terminals of the differential output terminals. The common mode voltage can be reduced by flowing the currents into the differential output terminals, and can be increased by leading the currents from the differential output terminals. Thus, a phase margin or a gain margin of a control signal loop can be secured even with low current consumption, thereby realizing stable operation of the circuit.
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Hayes & Soloway P.C.
NEC Electronics Corporation
Nguyen Patricia
LandOfFree
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