High-accuracy capacitor digital-to-analog converter

A capacitor digital-to-analog converter for converting an N-bit digital signal into an analog signal, said converter comprising:

• a converter capacitor network comprising 2N capacitors and 2N+1 MOS switches, said MOS switches being connected in a series chain at their respective source/drain, and each of said capacitors has a first electrode connected to a corresponding joining node between two consecutive MOS switches in said series chain and a second electrode connected together to a common node;
• and
• an output buffer comprising a differential amplifier and an output amplifier, output of said differential amplifier being connected to said output amplifier, said differential amplifier having 2N discrete inputs each connected to a corresponding one of said first electrodes of said capacitors in said converter capacitor network for converting said N-bit digital signal in said capacitor network into a voltage signal and sending to said output amplifier for amplification and output as converted analog signal.