| 摘要 |
<p>An analog-digital converter is provided to reduce a size and power consumption by using a small number of analog elements in comparison with a conventional analog-digital converter. An analog-digital converter includes a measurement signal generator(71), a variable delay unit(72), a fixed delay unit(73), and a delay calculating and data generating unit(80). The measurement signal generator(71) generates a measurement signal(in). When the generated measurement signal(in) is changed from a low level to a high level, a switch(SW) of the variable delay unit(72) connects a ground voltage and a first capacitor(C1). The variable delay unit(72) generates a sensing signal(sen) by delaying the measurement signal(in) for a first delay. The fixed delay unit(73) generates a reference signal(ref) by delaying the measurement signal(in) for a second delay. The delay calculating and data generating unit(80) calculates a delay difference between the reference signal(ref) and the sensing signal(sen), and generates digital data having a value corresponding to the calculated delay difference.</p> |
