Elastic surface wave oscillator

Abstract

Abstract PURPOSE:To make it possible to highly stabilize the output frequency, by taking out the difference or sum of oscillation frequencies of two elastic surface wave oscillators by which the propagating directions of the elastic surface wave propagating on the piezoelectric base board are different. CONSTITUTION:A pair of electrodes 11A, 12A and another pair of electrodes 11B, 12B are formed on the piezoelectric base plate 10 of X cut. And the oscillator 1A and the oscillator 1B are formed by connecting the electrodes 11A, 12A to the input and output terminals of the amplifier 13A, and connecting the electrodes 11B, 12B to the input and output terminals of the amplifier 13B, respectively. In this case, the propagating direction between the electrodes 11A, 12A is different from the propagating direction between the electrodes 11B, 12B, and the surface internal rotary angles phi1, phi2 are set so that the coefficients of delay time can be opposite. As a result, an oscillating output which is excellent in temperature characteristic is obtained from the mixer 2 outputting the difference or sum of the outputs of both the oscillators 1A, 1B, and therefore the output frequency can be highly stabilized.

Inventors

• 👤 Yasutaka Shimizu

Bibliographic Details