| CPC H03M 1/147 (2013.01) [H03M 1/1009 (2013.01); H03M 1/183 (2013.01)] | 18 Claims |
|
1. An apparatus configured to convert an analog input signal into a digital output signal, the apparatus comprising:
a first amplification circuit configured to receive the analog input signal and a plurality of reference voltages and configured to amplify differences between the analog input signal and the plurality of reference voltages;
a plurality of first capacitors configured to respectively store charges corresponding to signals outputted by the first amplification circuit;
a second amplification circuit configured to amplify differences among voltages of the plurality of first capacitors;
a plurality of second capacitors configured to respectively store charges corresponding to signals outputted by the second amplification circuit;
a comparison circuit configured to generate the digital output signal by comparing voltages of the plurality of second capacitors with each other;
a signal generation circuit configured to generate a first control signal and a second control signal, based on a clock signal, the first and second control signals exclusively activated at different times;
a plurality of first switches configured to electrically connect the first amplification circuit to the plurality of first capacitors in response to the first control signal being activated; and
a plurality of second switches configured to electrically connect the second amplification circuit to the plurality of second capacitors in response to the second control signal being activated.
|