Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2008-10-15
2010-12-28
Pascal, Robert (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S154000, C331S183000, C331S185000, C310S318000, C310S319000
Reexamination Certificate
active
07859352
ABSTRACT:
Systems and methods for insuring successful initiation of a resonating micro-electro mechanical systems (MEMS). An example system includes a resonating sensor, a drive device, a charge amplifier, and a voltage gain circuit. At start up, the charge amplifier and voltage gain circuit receives signals from the resonating sensor, compensates this signal for DC offsets, and generates a clock signal for the drive, thus placing the resonating sensor in a steady state operating mode. The circuit includes a plurality of gain switches that are toggled to produce a glitch in the signal associated with the received signal. The glitch overcomes the DC offset. A comparator generates the clock signal for the drive device if a signal associated with the received signal exceeds a reference signal.
REFERENCES:
patent: 5481914 (1996-01-01), Ward
patent: 6515751 (2003-02-01), Craighead et al.
patent: 2006/0033588 (2006-02-01), Caminada et al.
patent: 2008/0105054 (2008-05-01), Kanai et al.
Fogg & Powers LLC
Gannon Levi
Honeywell International , Inc.
Pascal Robert
LandOfFree
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