Oscillator circuit for use with high loss quartz resonator senso

Details Oscillator circuit for use with high loss quartz resonator senso Oscillator circuit for use with high loss quartz resonator senso

1993-08-18

1995-05-16

Pascal, Robert J.

Oscillators

Solid state active element oscillator

Transistors

331109, 331183, 331 65, 331158, 73290V, 73290R, 310316, H03B 530, G01R 2726

Patent

active

054164486

ABSTRACT:
The disclosure is directed to a Lever oscillator for use in high resistance resonator applications, especially for use with quartz resonator sensors. The oscillator is designed to operate over a wide dynamic range of resonator resistance due to damping of the resonator in mediums such as liquids. An oscillator design is presented that allows both frequency and loss (R.sub.m) of the resonator to be determined over a wide dynamic range of resonator loss. The Lever oscillator uses negative feedback in a differential amplifier configuration to actively and variably divide (or leverage) the resonator impedance such that the oscillator can maintain the phase and gain of the loop over a wide range of resonator resistance.

REFERENCES:
patent: 3649929 (1972-03-01), Thompson
patent: 3986145 (1976-10-01), Hongu et al.
patent: 4001718 (1977-01-01), Wilson et al.
patent: 4358742 (1982-11-01), Ferriss
patent: 4588968 (1986-05-01), Wile
patent: 4661785 (1987-04-01), Benjaminson
patent: 4817430 (1989-04-01), Benes et al.
patent: 4912976 (1990-04-01), Labriola
patent: 4914406 (1990-04-01), Ohkubo
patent: 5025231 (1991-06-01), Schwartzbach
patent: 5113153 (1992-05-01), Soyuer

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