Crystal oscillator

Details Crystal oscillator Crystal oscillator

2004-04-14

2009-08-04

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S175000, C331S074000, C331S1160FE, C331S1160FE, C331S176000, C324S076520, C073S054250

Reexamination Certificate

active

07570125

ABSTRACT:
An ocscillator circuit having: a) a piezoelectric crystal connected to a surface; b) a variable frequency generator for generating a driving signal which is supplied to the crystal to cause the crystal to oscillate, thereby causing the surface to oscillate; and, c) an analyser for monitoring the phase shift between the voltage across the crystal and the current flowing through it and, in response generating an adjustment signal which relates to the difference between the oscillation frequency and a resonant frequency of the crystal, the variable frequency generator being responsive to the adjustment signal to vary the frequency of the driving signal to cause the crystal to oscillate at the resonant frequency.

REFERENCES:
patent: 4818954 (1989-04-01), Flachenecker et al.
patent: 5416448 (1995-05-01), Wessendorf
patent: 6041642 (2000-03-01), Duncan
patent: 6820469 (2004-11-01), Adkins et al.
patent: 6865949 (2005-03-01), Blakley
patent: 6972553 (2005-12-01), Petrovich et al.
patent: 6978656 (2005-12-01), Blakley
patent: 6990852 (2006-01-01), Berndt
patent: 7093482 (2006-08-01), Berndt
patent: 2005/0132812 (2005-06-01), Blakley
patent: 1 528 394 (2005-05-01), None
patent: WO 01/02857 (2001-01-01), None
F. N. Dultsev et al., “Direct and Quantitative Detection of Bacteriophage by ‘Hearing’ Surface Detachment using a Quartz Crystal Microbalance”, Analytical Chemistry, American Chemical Society, vol. 73, No. 16, Aug. 15, 2001, pp. 3935-3939, XP-001089327.

Affiliated with

Also associated with

Rating

Crystal oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crystal oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal oscillator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4077563