| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a determination signal with desired time accuracy even when a relative change rate is small between an input signal and a reference signal. <P>SOLUTION: A superposed signal generation circuit 6 generates a superposed voltage Vadd which periodically repeats an additional signal of a differentiation waveform having larger amplitude than that of a noise added to an integration voltage Vint0 or a reference voltage Vref at regular intervals. An adder circuit 7 adds the superposed voltage Vadd to the integration voltage Vint0, and a comparator 8 compares an integration voltage Vint1 after the superposed voltage Vadd is added with the reference voltage Vref to output a determination signal Sd. <P>COPYRIGHT: (C)2012,JPO&INPIT |
