Patent ID: 7755399
Filing Date: 2010-07-13
Classification: H03F,H03K

Abstract:
1. A comparator circuit, comprising: a comparator circuit input terminal; an input capacitor having one end connected to the comparator circuit input terminal through a first switch and to the ground through a second switch; an amplifier circuit having a first input terminal connected to another end of the input capacitor and a second input terminal connected to a comparison potential; a second amplifier circuit having an input terminal connected to an output terminal of the amplifier circuit, and an output terminal connected to the first input terminal of the amplifier circuit through a third switch; and a latch circuit having an input terminal connected to the output terminal of the amplifier circuit and an output terminal connected to a comparator circuit output terminal, wherein during a sample operation the third switch is in a connection state and the second amplifier amplifies an output of the amplifier circuit.