Frequency modulated saw oscillator

Oscillators – Solid state active element oscillator – Significant distributed parameter resonator

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Details

330 55, 333 30R, 333 72, H03B 532

Patent

active

039796973

ABSTRACT:
An oscillator in which the "tank circuit" or feedback element is a surface acoustic wave (SAW) bandpass filter (delay line). A modulating voltage is applied from end-to-end of the piezoelectric substrate material to provide an incremental change of physical length of the substrate as a function of the modulating voltage. Two sets of interleaved fingers along a surface face of the substrate provide an interdigital arrangement for launching (electrical to acoustic transition) and receiving (acoustic to electrical transition) the surface acoustic wave.

REFERENCES:
patent: 3314022 (1967-04-01), Meitzler
patent: 3714604 (1973-01-01), Kaliski
patent: 3803520 (1974-04-01), Bristol et al.
patent: 3894286 (1975-07-01), Armstrong
patent: 3946342 (1976-03-01), Hartmann

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