Method and apparatus for frequency adjustment of monolithic crys

Details Method and apparatus for frequency adjustment of monolithic crys Method and apparatus for frequency adjustment of monolithic crys

1985-11-25

1988-02-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 81, G01R 2922

Patent

active

047257717

ABSTRACT:
Method for fine tuning center frequency and bandwidth of a monolithic crystal filter by means of adjusting its two resonator frequencies and its symmetric frequency to predetermined values. The three frequencies are preferably measured in a network that provides two balanced signals and is able to apply them alternately (for the measurement of the two resonator frequencies) and simultaneously (for the measurement of the symmetric frequency) to the two filter ports. The frequencies are adjusted by changing the mass distribution on the crystal wafer in sequential steps.

REFERENCES:
patent: 3963982 (1976-06-01), Roberts
patent: 4642505 (1987-02-01), Arvanitis

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