| 摘要 |
PROBLEM TO BE SOLVED: To provide an impedance adjusting circuit which prevents a malfunction due to noise. SOLUTION: The impedance adjusting circuit comprises an external resistor R20, a comparator 23 for comparing one end potential of the external resistor with a specified voltage, a counter 25 for outputting a control signal corresponding to its count value varying according to the output of the comparator 23, an NMOS array 26 connected to one end of the resistor R20 for providing a resistance value varying according to the control signal, and an NMOS mediating circuit 24 for detecting the output of the comparator 23 over three times to output a signal determined by the majority decision theory over these detected signals to the counter. COPYRIGHT: (C)2005,JPO&NCIPI |
