Phase-shift oscillator having ladder-type saw filter feedback circuit
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United States of America Patent
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Feb 23, 1999
Grant Date -
N/A
app pub date -
Sep 25, 1997
filing date -
May 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oscillation circuit of phase-shift type includes a surface acoustic wave filter in a feedback circuit, the surface acoustic wave filter having first and second one-port surface acoustic wave resonators of different resonance frequencies connected in a ladder configuration. The oscillation circuit has a high C/N ratio with a large bandwidth of variable frequency and can be fabricated in a small size with low costs.
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