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Title: Oscillator circuit for use with high loss quartz resonator sensors

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.
  1. (Albuquerque, NM)
Issue Date:
OSTI Identifier:
Sandia Corporation (Albuquerque, NM) SNL
Patent Number(s):
US 5416448
Contract Number:
Research Org:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
Country of Publication:
United States
oscillator; circuit; loss; quartz; resonator; sensors; disclosure; directed; lever; resistance; applications; especially; designed; operate; wide; dynamic; range; due; damping; mediums; liquids; design; allows; frequency; determined; negative; feedback; differential; amplifier; configuration; actively; variably; divide; leverage; impedance; maintain; phase; loop; oscillator circuit; differential amplifier; quartz resonator; dynamic range; wide range; negative feedback; wide dynamic; amplifier configuration; resonator sensors; /331/73/310/