Analog-to-digital converter

A system comprising:

• an analog-to-digital converter (ADC) to receive an analog input signal and a reset signal, the ADC to convert the analog input signal into a digital signal;
• a digital-to-analog converter (DAC), coupled to the ADC, to convert the digital signal into an internal analog signal;
• a buffer;
• a first capacitor, coupled to an output of the buffer, and an output of the DAC;
• a first switch, coupled between the buffer outut and the first capacitor;
• and
• a second switch to couple the first capacitor to ground;
• a second capacitor coupled between an input to the buffer and ground;
• and
• a third switch, coupled to the buffer, the second capacitor, and the ADC, to provide the analog input signal to the buffer, the second capacitor, and the ADC while the reset signal is in an asserted state,
• the first switch to provide the analog input signal to the first capacitor while the second switch is in a closed state, and the reset signal is in a deasserted state, and
• the DAC to provide the internal analog signal to the first capacitor while the first switch is in an open state and the second switch is in an open state.