| 摘要 |
A first amplifier circuit samples an input analog signal and holds the sampled signal for a predetermined period of time. A first analog-to-digital converter circuit samples the input analog signal and converts the sampled signal into a digital value of a predetermined number of bits. A first digital-to-analog converter circuit converts an output signal from the first analog-to-digital converter circuit into an analog signal. A first subtracting amplifier circuit with a capacitively coupled input receives a signal at one end of a capacitor connected to an input terminal of the subtracting amplifier circuit and which samples a signal occurring at the other end of the capacitor, the subtracting amplifier circuit subtracting an output signal from the first digital-to-analog converter circuit from an output signal from the first amplifier circuit, The first digital-to-analog converter circuit outputs the analog signal to the capacitor before a first switch is turned on, in order to adjust charges stored in the capacitor.
|
