SAW Resonators (TSR) Can Replace LC Elements and Quartz Crystals
Token SAW Resonator employs surface acoustic wave, and is able to be applied to high frequency circuit where conventional crystal, ceramic resonators are not available, as SAW Resonator oscillates stably with its fundamental mode over frequency range from 200 MHz to around 1 GHz.
The SAW resonator uses arrays of metal strips, with pitch λ/2, as reﬂectors of the waves. These arrays can give strong SAW reﬂections, and two arrays can be used to form a SAW cavity with high Q.
The AP1306 fan motor predriver is suited for two-coil brush-less DC fan. All functions, including lock shutdown, automatic restart, speed indication (FG), have been incorporated into one chip. When the motor is under lock condition, lock shutdown function turns off the output. When the lock condition is removed, the IC automatically restarts and allows DC fan to run. In addition, the FG function is to indicate the rotation speed.