Integrated circuit apparatus

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S552000, C327S554000

Reexamination Certificate

active

07554388

ABSTRACT:
According to an aspect of an embodiment, an apparatus comprises:a first current source and a second current source; a resistor connected between the first current source and a reference potential portion; a switched capacitor circuit having a variable capacitor, first switch and a second switch, the first switch and second switch alternately switching capable of charging a voltage to the variable capacitor and capable of discharging a electric charge of the variable capacitor; an integrating circuit having an output terminal and a first input terminal which is connected a portion between the second current source and the switched capacitor circuit, an integrating circuit for integrating a current from the portion and for exchanging into an output voltage of the output terminal; and a comparator for comparing the voltage between two end of the resistor and an output voltage of the integrating circuit.

REFERENCES:
patent: 5466976 (1995-11-01), Ichihara
patent: 6509791 (2003-01-01), Segawa et al.
patent: 2003/0169101 (2003-09-01), Yamamoto et al.
patent: 5-180881 (1993-07-01), None
patent: 2000-004143 (2000-01-01), None
patent: 2003-258604 (2003-09-01), None

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