Patent ID: 8456335
Filing Date: 2013-06-04
Classification: H03M

Abstract:
1. An A/D converter, comprising: an input signal changeover switch that selects a received signal or a correction signal from an external; a sampling capacitor part that includes first and second capacitors each having a terminal connected in inverse parallel to each other, and having a capacitance value equal to each other, is electrically connected to the input signal changeover switch, and accumulates sampling charge sampling the received signal or the correction signal therein; a successive approximation A/D conversion part that includes a plurality of internal DAC capacitors, is electrically connected to the input signal changeover switch, and conducts A/D conversion on the sampling charge; a first digital correction part that is electrically connected to the successive approximation A/D conversion part, and digitally corrects respective capacitance variations of the plurality of internal DAC capacitors; and a second digital correction part that is electrically connected to the first digital correction part, and digitally corrects a third-order or more factor of a voltage dependence of the sampling charge.