Driving device and driving method of capacitive load and...

Details Driving device and driving method of capacitive load and... Driving device and driving method of capacitive load and...

2008-12-01

2010-06-29

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S110000, C327S111000, C323S282000, C323S283000

Reexamination Certificate

active

07746127

ABSTRACT:
A driving device of a capacitive load includes a modulator that executes pulse modulation on a drive waveform signal. An inductor performs low-pass filtering on the modulated drive waveform signal and outputs the low-pass filtered signal as a drive signal towards a load capacitor as the capacitive load. A load selection control circuit selects a load capacitor and a dummy load capacitor to be connected to the inductor so that a sum of the capacitances of the selected load capacitor and dummy load capacitor is kept within a predetermined range. A feedback circuit executes a filtering process on the drive signal so that a frequency characteristic of a passing band of the drive signal becomes substantially flat. The resulting signal is provided to the modulator as a feedback signal. The modulator executes the pulse modulation on a difference value between the drive waveform signal and the feedback signal.

REFERENCES:
patent: RE38940 (2006-01-01), Isham et al.
patent: 7259603 (2007-08-01), Gibson et al.
patent: 11-020155 (1999-01-01), None
patent: 11-320782 (1999-11-01), None
patent: 2005-329710 (2005-12-01), None
patent: 2007-096364 (2007-04-01), None

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