OSCILLATOR

摘要

An oscillator which is used for a portable telephone or the like, comprises a transistor fabricated by MOS process, and entails a low level of noise other than the desired oscillation frequency. The oscillator includes quartz oscillating element 1 and a first amplifier 3 connected between input terminal 4 and output terminal 2. The first amplifier 3 has a first P-type transistor 11 and a first N-type transistor 12 both fabricated by MOS process. A gate 23 of the first P-type transistor 11 spans between a P-type source diffused region 22 and a P-type drain diffused region 21. A gate of the first N-type transistor 12 spans between an N-type source diffused region 18 and an N-type drain diffused region 19. The span of the gate 20 of the first N-type transistor 12 is longer than that of the gate 23, and the field strength is low, thereby lowering the noise level other than the oscillation frequency. <IMAGE>