| 摘要 |
The object is to provide a delay circuit capable of improving the accuracy of delay time with a simple circuit configuration. A delay circuit includes a first delay unit including a plurality of delay elements connected in series for detecting delay time characteristics of the first delay unit, a detection unit detects the number of delay elements used in the first delay unit to delay an input signal by a reference time, a second delay unit including a plurality of delay elements connected in series so as to output a signal delayed in accordance with the delay time characteristics of the first delay unit, and a selection unit selects the number of delay elements in the second delay unit to delay the input signal in accordance with the number of delay elements detected by the detection unit. The ratio between each of the delay values of the plurality of delay elements in the first delay unit and each of the delay values of the corresponding the plurality of delay elements in the second delay unit are equivalent to the ratio between the reference time and a desired delay time in the second delay unit.
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