| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain more accurate digital compensation by operating a selection means, a sample-and-hold means, an A/D converter and a digital compensation means or the like in response to a clock signal so as to generate a calibration value thereby repeating conversion process of a normal operation again and calculating a calibration value with higher resolution. SOLUTION: A selection means 10 is made up of a multiplexer selecting an input signal and a sample-and-hold means 12 samples the signal in response to a signal Q1 and holds the signal. A multi-bit A/D converter 18 configures again the hold signal to provide the output of an analog re-configuration signal Vb. An adder means 24 adds a digital correction signal and a digital compensation signal. A control means 28 controls the resolution of a calculated compensation signal to be detected as a compensation signal with a higher resolution than that in the normal operation and stores the signal to a digital compensation means 22. A digital compensation means detects a signal with high resolution by processing calculation data of the calibrated value.</p> |
