Patent ID: 6566916
Filing Date: 2003-05-20
Classification: H03K

Abstract:
A chopper type comparator, comprising:an input switch circuit which inputs an input voltage and a reference voltage alternately in response to a control signal; an output terminal which supplies an output voltage, having a level defined based on the difference between the input voltage and the reference voltage; a capacitor which is coupled between the input switch circuit and the output terminal; a node which is coupled between the capacitor and the output terminal; a first inverter coupled between the node and the output terminal; a first MOS transistor which is coupled between the node and the output terminal in parallel to the first inverter and operates in response to the control signal, the first MOS transistor having a substrate voltage terminal; a supply terminal which provides a supply voltage; a bias control circuit which selectively connects the substrate voltage terminal of the first MOS transistor to the supply terminal and the output terminal in response to the control signal; and a timing control circuit which provide a delay to the control signal to be supplied to the first MOS transistor and the input switch circuit.