Oscillators – Automatic frequency stabilization using a phase or frequency... – With stable heterodyne oscillator or source
Patent
1976-07-26
1977-10-25
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With stable heterodyne oscillator or source
330 55, 331 1R, 331107A, 332 26, 333 30R, 333 72, H03B 304, H03B 530
Patent
active
040558169
ABSTRACT:
An oscillator or similar device employing a frequency setting SAW element having a piezoelectric substrate and an arrangement of interdigital finger transducers mounted thereon. In one embodiment, two interdigital finger transducers provide surface acoustic wave launching and reception respectively and in another embodiment, two additional transducers form a part of a discriminator circuit. Phase detection either between the electrical connections of the launching and receiving transducers or through the discriminator arrangement generates a feedback control signal which is applied across the ends of the substrate as a stress-controlling signal in a manner to compensate for temperature and other environmental factors which otherwise change the frequency of oscillation.
REFERENCES:
patent: 3921093 (1975-11-01), Lewis
patent: 3936765 (1976-02-01), Lewis et al.
patent: 3979697 (1976-09-01), Donahue
Grimm Siegfried H.
International Telephone and Telegraph Corporation
O'Neil William T.
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