| 摘要 |
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.
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