Vibrator controlling circuit

Details Vibrator controlling circuit Vibrator controlling circuit

2005-05-24

2005-05-24

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Tactual indication

C340S384700, C340S007600, C379S052000

Reexamination Certificate

active

06897766

ABSTRACT:
This invention includes a square wave signal generating circuit20for generating a square wave signal whose frequency changes; a MOS transistor12which is turned on/off on the basis of the square wave signal to supply a driving current to a vibrator14; and a frequency shift detecting circuit24for detecting a frequency shift between the square wave signal from the square wave generating circuit and a resonance frequency of the vibrator. The shift in the frequency generated by the square wave generating circuit is trimmed by a signal detected by the frequency shift detecting circuit.

REFERENCES:
patent: 4395665 (1983-07-01), Buchas
patent: 5436622 (1995-07-01), Gutman et al.
patent: 5682132 (1997-10-01), Hiroyoshi et al.
patent: 5936516 (1999-08-01), Narea et al.
patent: 6057753 (2000-05-01), Myers
patent: 6650232 (2003-11-01), Strohbeck et al.
European Search Report dated Apr. 3, 2003.

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