A new method of waveform digitization based on time-interleaved A/D conversion

TL;DR

This paper introduces a fully parallel mismatch correction algorithm for time-interleaved A/D conversion, enabling real-time waveform digitization at 1 Gsps with high accuracy and broad bandwidth.

Contribution

It presents a novel fully parallel correction algorithm for TIADC, allowing real-time mismatch correction and high-speed digitization beyond hardware speed limitations.

Findings

Achieved 1 Gsps sampling rate with 10.5 ENOB

Implemented real-time mismatch correction algorithm

Demonstrated broad bandwidth from 5 MHz to 200 MHz

Abstract

Time interleaved analog-to-digital conversion (TIADC) based on parallelism is an effective way to meet the requirement of the ultra-fast waveform digitizer beyond Gsps. Different methods to correct the mismatch errors among different analog-to-digital conversion channels have been developed previously. To overcome the speed limitation in hardware design and to implement the mismatch correction algorithm in real time, this paper proposes a fully parallel correction algorithm. A 12-bit 1-Gsps waveform digitizer with ENOB around 10.5 bit from 5 MHz to 200 MHz is implemented based on the real-time correction algorithm.