Circuit with variation correction function

Details Circuit with variation correction function Circuit with variation correction function

2003-03-31

2011-11-01

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

08049539

ABSTRACT:
A circuit with variation correction function is capable of obtaining an output characteristic near a desired value by suppressing variation of the output characteristic regardless of manufacturing characteristic variations of a component. An output signal different in phase from a reference signal is obtained by a dummy circuit having a capacitor of a same structure as a correction object capacitor in an operation circuit. The difference in phase between the reference signal and the output signal reflects manufacturing characteristic variation of the correction object capacitor. The difference in phase is detected by a phase comparator circuit and control signals are created by a control signal conversion circuit. Switches in the operation circuit are changed over with the control signal to adjust the capacitance of the correction object capacitor. The correction object capacitor is actuated at a capacitance near design capacitance regardless of manufacturing characteristic variation of the correction object capacitor.

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