| 摘要 |
PURPOSE:To decrease the characteristic change in an oscillating frequency against variance in Q of an LC resonance load by adding a diode to a transistor (TR) forming a differential circuit. CONSTITUTION:A diode 19 is added between a reference potential point of a positive pole of a power supply 11 and a collector of a TR15. That is, the LC oscillating circuit uses the diode 19 to bring the TR15 to a saturated region in the control range of a control current I. In this case, a voltage capacity VF of the diode 19 is set smaller than a base-emitter voltage VBE of the TR15. This is because the degree of the saturation of the TR15 is larger as the VF approaches more the VBE and the change in the oscillating frequency is increased. Through the forming above, the characteristic change in the oscillating frequency is reduced against variance in the Q of the LC resonance load. |
