| 摘要 |
PROBLEM TO BE SOLVED: To provide a reference voltage generation circuit generating a minute reference voltage while reducing power consumption, and a reference current generation circuit generating a minute reference current while reducing the dimension of a reference resistance. SOLUTION: When an output voltage of a regulator 14 is divided by means of a resistance division circuits consisting of resistors R1 and R2, a minute reference voltage is generated. The resistance division circuit is constructed so that it can be connected/disconnected by means of a switch consisting of a transistor Q3. Between a connection point P for the resistors R1 and R2 and a reference voltage output terminal, a switch constructed of a transistor Q4 is arranged, and a capacitor C is connected to the output terminal. The transistors Q3 and Q4 are controlled to be turned on/off by a clock pulse outputted by a control circuit 16. The capacitor C is charged to reference voltage when it is turned on, and the output terminal is kept at the reference voltage when it is turned off. COPYRIGHT: (C)2007,JPO&INPIT
|
