| 摘要 |
In a signal detection method in which a correlated double sampling is performed, a signal-to-noise ratio of a detected signal is improved and the speed of signal detection is increased. When storing a baseline signal in the first holding circuit 32, low-pass filtering is performed by the first low-pass filter formed of the resistor R1, on-resistances of the switches S2, S4, and capacitor C1by switching ON the switches S2, S4. When storing a signal component in the second holding circuit 33, low-pass filtering is performed by the second low-pass filter formed of the resistor R2, on-resistance of the switch S5, and capacitor C2 by switching OFF the switch S3 and switching ON the switch S5. A time constant tau1 of the first low-pass filter, and a time constant tau2 of the second low-pass filter are set to values that satisfy the relationship of tau1<tau2.
|
