Digital post-calibration of a 5-bit 1.25 GS/s flash ADC  

作　　者：Yang Yang Zhao Xianli Zhong Shun’an Li Guofeng 杨阳;赵显利;仲顺安;李国峰(Department of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]Department of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Semiconductors》2012年第2期122-126,共5页半导体学报（英文版）

基　　金：supported by the Microelectronics Laboratory,Department of Science and Electronics,Beijing Institute of Technology,and the Photonics Laboratory,Department of Electrical Engineering,University of California-Los Angeles

摘　　要：We report a high-speed flash analog to digital converter（ADC） linearization technique employing the inverse Volterra model and digital post processing.First,a 1.25 GS/s 5-bit flash ADC is designed using a 0.18μm CMOS,and the signal is quantized by a distributed track-and-hold circuit.Second,based on the Volterra series, a proposed digital post-calibration model is introduced.Then,the model is applied to estimate and compensate the nonlinearity of the high-speed flash ADC.Simulation results indicate that the distortion is reduced effectively. Specifically,the ADC achieves gains of 4.83 effective bits for a 117.1 MHz frequency input and 4.74 effective bits for a Nyquist input at 1.25 GS/s.We report a high-speed flash analog to digital converter（ADC） linearization technique employing the inverse Volterra model and digital post processing.First,a 1.25 GS/s 5-bit flash ADC is designed using a 0.18μm CMOS,and the signal is quantized by a distributed track-and-hold circuit.Second,based on the Volterra series, a proposed digital post-calibration model is introduced.Then,the model is applied to estimate and compensate the nonlinearity of the high-speed flash ADC.Simulation results indicate that the distortion is reduced effectively. Specifically,the ADC achieves gains of 4.83 effective bits for a 117.1 MHz frequency input and 4.74 effective bits for a Nyquist input at 1.25 GS/s.

关 键 词：flash ADC Volterra series digital post-calibration 

分 类 号：TN792[电子电信—电路与系统]