Full-wave rectifier for capacitance measurements

Details Full-wave rectifier for capacitance measurements Full-wave rectifier for capacitance measurements

2006-05-16

2006-05-16

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S680000

Reexamination Certificate

active

07046017

ABSTRACT:
One embodiment of the present invention provides an electronic circuit and method for measuring a capacitance. A signal generating mechanism generates a signal having a predefined frequency and predefined low and high voltage levels on one terminal of the capacitance. The other terminal of the capacitance is coupled to a switching mechanism. The switching mechanism is set to couple the other terminal of the capacitance to a first amplifier or a second amplifier for a portion of each signal cycle thereby full-wave rectifying a transient current flowing between the two terminals in the capacitance. Outputs of the first amplifier and the second amplifier are coupled to a current measurement mechanism for measuring the current. The capacitance is determined from the measured current. Several variations on this embodiment are provided.

REFERENCES:
patent: 3577072 (1971-05-01), Miller
patent: 5629838 (1997-05-01), Knight et al.
patent: 6366098 (2002-04-01), Froment
patent: 6728113 (2004-04-01), Knight et al.
patent: 6916719 (2005-07-01), Knight et al.

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