Patent ID: 7719581

Claim:
A sample and hold circuit, comprising: an amplifier having an input terminal and an output terminal; a column input line; an capacitor having first and second terminals for storing charge from the column input line during a sampling period; and first and second switches, each switch having first and second ends, the first end of the first switch being connected to the output terminal of the amplifier and the second end of the first switch being connected to the first terminal of the capacitor and the first end of the second switch being connected to the column input line and the second end of the second switch being connected to the first terminal of the capacitor for selectively switching the first terminal of the capacitor between the column input line and the output terminal of the amplifier, wherein at a start of the sampling period the first switch is initially configured to be open and the second switch is initially configured to be closed and, during the sampling period, the first switch is switched to be closed subsequent to the second switch being switched to be opened.