Measurements of acceleration-induced phase noise in surface acoustic wave devices

Measurements of the acceleration sensitivities of a group of surface acoustic wave (SAW) resonators developed for a low-noise radar application are presented. The SAW resonator designs were systematically varied in order to obtain the best possible phase noise in a quiescent environment. A block diagram of the test system used is shown. Sample data obtained using the measurement system are shown. The maximum and minimum values obtained at each acceleration frequency tested are shown as a function of the test frequency. The relationships between the design changes and the vibration induced phase noise are discussed. It is suggested that careful control of transducer and busbar metallization may be used to optimize for acceleration induced phase noise without seriously compromising quiescent phase noise