| 摘要 |
PROBLEM TO BE SOLVED: To provide a power voltage reduction compensating circuit capable of maintaining the operation of an oscillator with a sufficient margin even when a battery voltage is lowered. SOLUTION: In this circuit, a switch 3 is inserted in series between a power source terminal Vcc of an oscillator 1 and a positive voltage terminal (+) of a battery 2, a resistor R1, a capacitor C1 and the serial connection of the cathode of a diode D1 and the anode of a diode D2 are inserted in parallel between a negative voltage terminal (-) of the battery 2 and a ground terminal GND of the oscillator 1, further a hybrid transformer 4 is inserted between the output of the oscillator 1 and a signal output terminal and the branch output of the hybrid transformer 4 is connected through a capacitor C2 to the node of the cathode of the diode D1 and the anode of the diode D2. Besides, a circuit composed of the resistor R1, the capacitors C1 and C2 and the diodes D1 and D2 is a negative voltage generating circuit 5.
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