| 摘要 |
There is provided an internal oscillation transistor (11, 12); a terminal that is connected to the base of the oscillation transistor (10a, 10b) and to which an external resonance circuit is to be connected; and two internal diodes (18, 19) provided between the terminal and the ground, for preventing electrostatic breakdown of the oscillation transistor. The cathodes of the two diodes are connected to each other and supplied with a reverse-bias voltage. The anode of one diode is grounded and the anode of the other diode is connected to the terminal by a first resistor. An internal second resistor for DC-grounding the terminal is also provided. <IMAGE> |
