| 摘要 |
PROBLEM TO BE SOLVED: To provide an A/D conversion circuit in which A/D conversion accuracy is improved by detecting the transit position of a pulse signal in units of inverting circuit. SOLUTION: A pulse transit position detection circuit 11 detects a transit position of a pulse signal output from a pulse transit circuit 10 to generate a logical signal according to the transit position. A pulse transit position detection circuit 12 detects the circling number of the pulse signal output from the pulse transit circuit 10 and generates a logical signal according to the circling number. The digital signal generation circuit 13 synthesizes the logical signals output from the first and second pulse transit position detection circuits 11, 12 and generates a digital signal according to a size of an analog signal VA. The pulse transit circuit 10 is configured so that a sum of the number of the inverting circuits that the pulse signal transits in an N-th period (N: a natural number) and the number of the inverting circuits that the pulse signal transits in an (N+1)-th period is a power of 2. COPYRIGHT: (C)2011,JPO&INPIT
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