To obtain an oscillator and electronic devices using the oscillator, which can adjust and suppress the duty ratio of an output signal correcting standard bias voltage, according to high distortion input waveforms whose occurrence frequency is high or to the variation of ambient temperature.

The oscillator 1A is composed of an ECL line receiver and includes a differential amplifier which is formed by an IC chip 2, a switch circuit, a phase shift circuit 4 which adjust the phase shift quantity, a piezoelectric resonator 5 which oscillates at a predetermined oscillation frequency, an impedance circuit 6, a voltage-changing measure which can change a bias voltage VBB1, that is supplied to reverse input terminals of the differential amplifier for oscillation, based on the standard bias voltage VBB outputted from the IC chip 2.