Circuit calibration using a time constant

Details Circuit calibration using a time constant Circuit calibration using a time constant

2006-06-02

2008-08-12

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07411381

ABSTRACT:
According to one general aspect, an apparatus includes a first resistor in a first current path of a resistor-capacitor (RC) circuit, the resistor connected to a power source. A variable capacitor is included in a second current path of the RC circuit and operably connected to the power source and a virtual ground generator. A comparison circuit is configured to make a determination regarding a voltage VR across the resistor to a ground relative to a voltage VC across the capacitor to a virtual ground from the virtual ground generator. A control circuit is configured to make an adjustment of a value of the variable capacitor, based on the determination.

REFERENCES:
patent: 6628163 (2003-09-01), Dathe et al.
patent: 6731145 (2004-05-01), Humphreys et al.
patent: 6891414 (2005-05-01), Bunch et al.
patent: 2007/0194840 (2007-08-01), Dathe et al.

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