Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-05-21
2010-12-14
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S293000, C330S294000
Reexamination Certificate
active
07852158
ABSTRACT:
An operational amplifier includes, between an input and an output of an operational amplifier (an operational amplification stage)10, a feedback capacitor34connected in negative feedback, a phase control circuit100having a resistor element (a resistor unit)30connected in series to the feedback capacitor34. Load capacitors (load units)32are connected on the output side of the operational amplifier10and driven by an output signal from the operational amplifier10. In a case that the capacitance values of the load capacitor32and33are increased and the phase margin of the operational amplifier becomes excessive in comparison with the optimum value, a resistance value ROof the resistor element30is increased to control the phase margin of the operational amplifier so as to fall within the optimum range, and thus accelerated settling properties are realized. This invention thus provides a phase control circuit applicable even to a single-stage operational amplifier, and by enhancing the properties of the operational amplifier itself and enabling the phase margin to be controlled, realizes accelerated settling properties even in a case that a transient response is deteriorated.
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Kobayashi Satoshi
Nakatsuka Junji
McDermont Will & Emery LLP
Nguyen Patricia
Panasonic Corporation
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