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.