| 摘要 |
<p>The oscillator comprises a feedback amplifier (10) consisting of an FET (106) and a varactor diode (3) acting as a load-coupling capacitor. A part of the output from the amplifier is supplied as oscillation output to an external load (300) including a high-output amplifier and an antenna device. The varactor diode has a junction capacitance which varies according to the bias voltage applied to the diode. This diode capacitively couples the amplifier to the external load through the variable junction capacitance. Therefore, the capacitance value of the load-coupling capacitor can be changed by adjusting the bias voltage. Thus, the variation of the capacitance of the load-coupling capacitor caused by design errors or by variations of the conditions of the manufacturing process can be easily corrected when the device is in use. In consequence, the oscillator can be operated always with good oscillating characteristics without hindering integration of individual components or a reduction in the cost. <IMAGE></p> |
