【摘要】：提出了一種帶參考注入信號的校準(zhǔn)算法,用于校準(zhǔn)時間交織模數(shù)轉(zhuǎn)換器(Time-Interleaved Analog-to-Digital Converter,TIADC)的時間失配誤差。該算法引入?yún)⒖甲⑷胄盘?參考注入信號通過采樣保持電路(sample hold circuit,S/H)后,利用TIADC的各子通道時鐘依次控制S/H,對其輸出后的值進(jìn)行運算獲得時間誤差,再將時間誤差反饋回多相時鐘產(chǎn)生器,利用可變延遲線實現(xiàn)時間失配的補(bǔ)償。該算法運算簡單,消耗的硬件資源低,對輸入信號沒有限制,可以擴(kuò)展到任意通道。算法應(yīng)用于一個4通道12 bits的TIADC,當(dāng)輸入信號的歸一化頻率f_(in)/f_s=0.485 0,設(shè)定的最大誤差為1.0% T_s時,MATLAB仿真結(jié)果表明,經(jīng)過本算法校準(zhǔn)后的SFDR從31.009 4 dB提高到了95.627 0 dB,SNDR從31.074 9 dB提高到了73.480 5 dB,證明了該校準(zhǔn)方案的有效性。
[Abstract]:A calibration algorithm with reference injection signal is proposed to calibrate the time mismatch of time Interleaved Analog-to-Digital Converter (Time-Interleaved Analog-to-Digital Converter,TIADC). The reference injection signal is introduced in the algorithm. After the reference injection signal is sampled and held by (sample hold circuit,S/H), the clock of each sub-channel of TIADC is used to control S / H in turn, and the time error is obtained by calculating the output value. Then the time error is fed back to the polyphase clock generator and the time mismatch is compensated by the variable delay line. The algorithm is simple in operation, low in hardware resources and unlimited in input signal, and can be extended to any channel. The algorithm is applied to a 4-channel 12 bits TIADC, when the input frequency f _ (in) / f_s=0.485 0 is normalized, and the maximum error is 1.0% T _ s. The simulation results of MATLAB show that, The effectiveness of the proposed calibration scheme is proved by the improved SFDR from 31.009 4 dB to 95.627 0 dB,SNDR from 31.074 9 dB to 73.480 5 dB,.
【作者單位】： 合肥工業(yè)大學(xué)微電子設(shè)計研究所;
【分類號】：TN792

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