Oscillators – Electromechanical resonator – Crystal
Patent
1996-01-11
1997-10-07
Mis, David
Oscillators
Electromechanical resonator
Crystal
331 18, 331 65, 331116R, 310318, H03B 536, H03L 706
Patent
active
056752962
ABSTRACT:
A drive voltage is supplied to a piezoelectric oscillator from an A.C. drive power source. Attached to an electrode of the piezoelectric oscillator is a loop circuit in which an amplifier having a (N+1) voltage amplification factor and an electrostatic capacitor are connected in series. When the electrostatic capacity is set to 1/N of a damping capacity of the piezoelectric oscillator, the current flowing through the damping capacity is replaced and shared by current from the electrostatic capacity, thus the drive current will not be consumed by the damping capacity. Therefore, a condition where the damping capacity is minimized depends on a capacity value of the electrostatic capacity and amplification factor of the amplifier only and does not depend on the frequency.
REFERENCES:
patent: 3731230 (1973-05-01), Cerny, Jr.
patent: 4227158 (1980-10-01), Schroeder et al.
patent: 4734659 (1988-03-01), Tanaka et al.
patent: 4782309 (1988-11-01), Benjaminson
patent: 5047734 (1991-09-01), Newell et al.
patent: 5113153 (1992-05-01), Soyuer
patent: 5136263 (1992-08-01), Lane
Bever Patrick T.
Mis David
Shoup Guy W.
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