| 摘要 |
PROBLEM TO BE SOLVED: To provide a comparator circuit in which even when the inclination of a change in a comparison input signal is small, a stable waveform is outputted without oscillation or the like, and the magnitude of the comparison input signal is discriminated with a fixed threshold value regardless of an increase/decrease direction of the comparison input signal. SOLUTION: The comparator circuit 100 comprises: a capacitive element 4 which is charged/discharged in accordance with a potential difference between a comparison input signal IN and a reference input signal REF; an analog buffer section 5 which outputs a high level when that voltage is equal with or higher than a threshold voltage Vth, or outputs a low level when that voltage is lower than the threshold voltage Vth; an edge detection section 7 which detects rising and falling edges of the analog buffer section 5 and outputs an up signal UP and a down signal DOWN; and a charge pump section 8 which charges a capacitive section in response to the up signal UP and discharges the capacitive section in response to the down signal DOWN. COPYRIGHT: (C)2007,JPO&INPIT
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