%0 Journal Article
%T A fast combination calibration of foreground and background for pipelined ADCs<br>应用于流水线模数转换器的快速前后台组合数字校正
%A Sun Kexu
%A He Lenian
%A <br>孙可旭
%A 何乐年
%J 半导体学报
%D 2012
%I 
%X This paper describes a fast digital calibration scheme for pipelined analog-to-digital converters (ADCs). The proposed method corrects the nonlinearity caused by finite opamp gain and capacitor mismatch in multiplying digital-to-analog converters (MDACs). The considered calibration technique takes the advantages of both foreground and background calibration schemes. In this combination calibration algorithm, a novel parallel background calibration with signal-shifted correlation is proposed, and its calibration cycle is very short. The details of this technique are described in the example of a 14-bit 100 Msample/s pipelined ADC. The high convergence speed of this background calibration is achieved by three means. First, a modified 1.5-bit stage is proposed in order to allow the injection of a large pseudo-random dithering without missing code. Second, before correlating the signal, it is shifted according to the input signal so that the correlation error converges quickly. Finally, the front pipeline stages are calibrated simultaneously rather than stage by stage to reduce the calibration tracking constants. Simulation results confirm that the combination calibration has a fast startup process and a short background calibration cycle of 2 × 221 conversions.
%K background calibration
%K capacitor mismatch and gain calibration
%K digital calibration
%K foreground calibration
%K pipelined analog-to-digital converter
%K signal-shifted correlation<br>后台校正、电容失配和运放增益校正、数字校正、前台校正、流水线模数转换器、平移信号相关
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=025C8057C4D37C4BA0041DC7DE7C758F&aid=649CF1A01F52D57128FFDAAF1F658FCB&yid=99E9153A83D4CB11&vid=27746BCEEE58E9DC&iid=B31275AF3241DB2D&sid=E77EEB72EA6E0D10&eid=708DD6B15D2464E8&journal_id=1674-4926&journal_name=半导体学报&referenced_num=0&reference_num=23