Transimpedance oscillator having high gain amplifier
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United States of America Patent
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-
Nov 9, 1982
Grant Date -
N/A
app pub date -
Mar 7, 1980
filing date -
Mar 7, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transimpedance amplifier is connected in a positive regenerative loop with a crystal resonator. The transimpedance amplifier includes a high gain amplifier with a parallel resistor and capacitor thereacross. A virtual ground is created at the node between the resonator and the amplifier input thereby eliminating circuit sensitivity to inherent capacitive changes between the resonator and true ground. Components are chosen to maintain oscillations at series resonance and achieve insensitivity to changes in the motional resistance of the resonator.
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