Patent ID: 8830100
Filing Date: 2014-09-09
Classification: H03M

Abstract:
1. A digital-analog converter comprising: a sampling capacitive element sampling a digital signal input from the outside; an operational amplifier; a summing node switch unit capable of electrically connecting and disconnecting one end of the sampling capacitive element and an inverting input terminal of the operational amplifier; and a feedback switch unit disposed between an output terminal of the operational amplifier and the other end other than the one end of the sampling capacitive element and capable of electrically connecting and disconnecting the output terminal of the operational amplifier and the other end of the sampling capacitive element, wherein the summing node switch unit and the feedback switch unit include a MOS transistor, and an on-resistance value of the MOS transistor for a summing node switch included in the summing node switch unit is set to be larger than the on-resistance value of the MOS transistor for a feedback switch included in the feedback switch unit until a predetermined time elapses from a time point where the one end of the sampling capacitive element and the inverting input terminal of the operational amplifier are electrically connected to each other.