Design of high-resolution pipelined analog-to-digital converters using multiple-phase capacitor-splitting feedback interchange technique

A new technique, the multiple-phase capacitor-splitting feedback interchange (MP-CSFI) technique, is presented to reduce the harmonic distortion due to the capacitor mismatch for pipelined ADCs. The basic idea is to split the capacitors in the sub-DACs of a pipelined ADC and dynamically select the subsets of the split capacitors as the feedback ones during its operation such that the nonideal effects caused by the capacitors' mismatches can be disturbed and modulated to a higher frequency band. A 12-bit, 35 MHz pipelined A/D converter with the proposed technique is designed and simulated using the TSMC 0.25 μm 1P5M technology to demonstrate the effectiveness of this technique.