Amplifiers – With semiconductor amplifying device – Including signal feedback means
Reexamination Certificate
2011-07-26
2011-07-26
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including signal feedback means
C330S260000, C330S257000, C323S316000
Reexamination Certificate
active
07986188
ABSTRACT:
A circuit includes a differential amplifier unit that receives an input signal at a non-inverting input thereof, a constant current source, a load circuit, an output transistor that receives an output of the differential amplifier unit as an input and drives a load circuit, a phase compensation circuit including a variable resistor and a capacitor connected in series between the input of the output transistor and a feedback path, an output current monitor circuit that detects an output current flowing through the output transistor, and a bias voltage generation circuit that varies a resistance value of the variable resistor in accordance with a result of the detection of the output current by the output current monitor circuit. A signal obtained by voltage dividing an output of the output transistor by resistors is supplied to an inverting input of the differential amplifier unit.
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Elpida Memory Inc.
Nguyen Patricia
Sughrue & Mion, PLLC
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