System for fast piezoelectric-resonator parameter measurements
AssigneeTransat Corp.
InventorDavid Flugan
Life of this patent
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Abstract
Method and apparatus are described for speeding parameter measurements of piezoelectric-resonators. A large driving voltage is applied to the resonator until the resonator current reaches its desired steady-state value. Then the driving voltage is reduced to a level which will maintain that desired current level. This procedure allows the resonator to reach its steady state conditions faster than if a constant drive voltage were used.
Claims6
Method for measuring electrical parameters of piezoelectric resonators at a predetermined constant voltage level, based on
- 1) initially applying a voltage larger than the predetermined voltage, and of a first frequency near resonance, to the resonator,
- 2) reducing the voltage during an initial transient phase to the predetermined value, using negative feedback,
- 3) after the transient phase, holding the voltage to the predetermined constant voltage,
- 4) measuring the resonator's electrical response to that voltage,
- 5) making at least one more measurement at a different frequency near resonance,
- 6) repeating steps 2),3),4),
- 7) computing the electrical parameters from the measurement results.
Apparatus for measuring the electrical parameters of piezoelectric resonators at a predetermined constant voltage level, comprising a variable-frequency voltage source, connectable to the resonator, and means for
- initially applying a voltage larger than the predetermined voltage to the resonator, then
- reducing the voltage during an initial transient phase to the predetermined value by means of negative feedback,
- after the transient phase, holding the voltage to the constant predetermined value, and
- measuring the resonator response at a frequency near resonance,
- making at least one more measurement at a different frequency near resonance,
- computing the electrical parameters from the measurement results.
Dependencies are inferred from the claim text.