Acoustic surface wave resonator device

Claim 1

An assembly for an acoustic surface wave resonator device and a printed circuit board, said assembly comprising: (a) an acoustic surface wave resonator element having a piezoelectric substrate, first and second interdigital electrodes formed on one major surface of said piezoelectric substrate, said first interdigital electrode including first and second interleaving comb-shaped electrodes separated at a predetermined distance from each other on said major surface of said piezoelectric substrate, said second interdigital electrode including third and fourth interleaving comb-shaped electrodes separated at a predetermined distance from each other on said major surface of said piezoelectric substrate, and a pair of acoustic surface wave reflectors formed on said major surface of said piezoelectric substrate so as to sandwich said first and second interdigital electrodes; (b) a base for mounting said acoustic surface wave resonator element thereon; (c) first, second, and third lead terminals arranged on said base at positions substantially corresponding to three adjacent corners of a regular n-sided polygon, said first lead terminal being disposed between said second and third lead terminals; (d) a first connection member for connecting said first lead terminal to said first interleaving comb-shaped electrode; (e) a second connection member for connecting said second lead terminal to said third interleaving comb-shaped electrode; (f) a third connection member for connecting said third lead terminal to said fourth interleaving comb-shaped electrode, and (g) reference potential applying means coupled to said second interleaving comb-shpaed electrode to apply a reference potential thereto; and a printed circuit board having first, second, and third openings arranged in correspondence with said first, second, and third lead terminals of said acoustic surface wave resonator device so as to respectively receive said first, second, and third lead terminals, first and second signal line patterns being respectively provided in said first and second openings, and a grounding line pattern being provided in said third opening; said first, second, and third lead terminals of said acoustic surface wave resonantor device being respectively inserted in said first, second, and third openings of said printed circuit board with a first orientational relationship with respect to said printed circuit board when used in an in-phase oscillator application, said first, second, and third lead terminals being inserted in said openings with a second orientational relationship with respect to said printed circuit board which is different from said first orientational relationship when used in an out-of-phase oscillator application, the difference between the first and second orientational relationshps being provided by rotating said first to third lead terminals by an angle 2π/η of with respect to said printed circuit board.