Piezoelectric crystal unit

Details Piezoelectric crystal unit Piezoelectric crystal unit

1975-09-04

1977-03-22

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 82, 310 98, H03H 920, H03H 904, H03H 932, H03H 924

Patent

active

040139824

ABSTRACT:
A piezoelectric monolithic crystal filter having shunt trimming capacitors incorporated into the design of the filter as electrode strips at the edges of the crystal element. This eliminates the need to use discrete low value shunt trimming capacitors which generally are of a few pico-farad capacitance and are expensive and introduce objectionable lead inductance which is non-linear with frequency. A means is provided for producing filters which are less expensive and improve performance over conventional filters, particularly at higher frequencies.

REFERENCES:
patent: 2963597 (1960-12-01), Gerber
patent: 3416036 (1968-12-01), Ho
patent: 3624431 (1971-11-01), Machida et al.
patent: 3659123 (1972-04-01), Oya
patent: 3676724 (1972-07-01), Berlincourt
patent: 3727154 (1973-04-01), Dailing et al.
patent: 3838366 (1974-09-01), Coussot

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