Oscillator unit

Details Oscillator unit Oscillator unit

1995-10-04

1996-10-01

Mis, David

Oscillators

Electromechanical resonator

Crystal

331 1A, 331 65, 331173, 331158, 7350413, 310318, H03B 504, H03B 506, H03B 536, H03L 300

Patent

active

055614000

ABSTRACT:
An electrical circuit for reliably starting the oscillation of an oscillator comprising a cylindrical piezoelectric body on which an exciting electrode, a feedback electrode which causes an oscillation, and an electrode for detecting an angular rate are mounted. The electrical circuit includes an exclusive OR gate for detecting a phase difference between an exciting voltage and a voltage developed at the feedback electrode, a circuit for integrating an output voltage from the gate and a band pass filter having its resonant frequency shifted in proportion to a voltage from the integrating circuit. The band pass filter is effective to provide an automatic adjustment of a phase difference of a voltage, which is actually fed back to the exciting electrode, with respect to a voltage developed at the feedback electrode. In this manner, if the natural frequency of the oscillator is offset from a reference value, it is assured that a phase difference between the exciting voltage and the voltage which is actually fed back to the exciting electrode be equal to 360.degree.. The electrical circuit also includes an oscillation starter circuit which increases the gain of a positive feedback loop including the filter for a given time interval immediately after the turn-on of the power.

REFERENCES:
patent: 4609885 (1986-09-01), Renoult
patent: 4810922 (1989-03-01), Hirsch
patent: 4951508 (1990-08-01), Loper, Jr. et al.
patent: 5063358 (1991-11-01), Vale et al.
patent: 5160901 (1992-11-01), Stone
patent: 5184094 (1993-02-01), Kohler
patent: 5218867 (1993-06-01), Varnham et al.
patent: 5419194 (1995-05-01), Varnham et al.

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1504600