Oscillators – Electromechanical resonator
Reexamination Certificate
2005-07-15
2008-08-12
Pascal, Robert J. (Department: 2817)
Oscillators
Electromechanical resonator
C073S504120, C310S318000
Reexamination Certificate
active
07411465
ABSTRACT:
A drive circuit apparatus for use in generating a drive signal for energizing an actuator about a natural resonant frequency is disclosed. The circuit has a counter that generates a count sequence derived from a drive sense signal. Additionally, a demodulator is further coupled to the counter and generates a voltage level signal from the drive sense signal based on the count sequence. A digital to analog (D/A) converter is coupled to both the counter and demodulator. The D/A converter generates the drive signal in a substantially constant phase relationship with respect to the drive sense signal as derived from the voltage level signal and based on the count sequence. In addition, a method of generating a drive signal for energizing an actuator about a natural resonant frequency is provided.
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Gannon Levi
Pascal Robert J.
Patterson Thuente Skaar & Christensen P.A.
Watson Industries Inc.
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