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提出一种应用于14bit100MS/s流水线模数转换器(ADC)的数字后台校准算法.该算法利用伪随机信号(PN)随机改变子ADC中比较器的阈值电压,间接注入宽度大幅度抖动信号测量ADC电路中由于电容失配和放大器有限增益造成的误差,并在数字域内对这些误差进行补偿.该方法能有效减小因电容失配和放大器有限增益等非理想因素对流水线ADC性能的影响,改善ADC的动态性能.该算法实现过程中无须增加采样电容和比较器数目,校准运算时无须复杂计算,实现简单,应用灵活.仿真结果表明:采用该技术校准后,流水线ADC的信号噪声失真比从63.3dB提高到78.7dB,无杂散动态范围从65.5dB提高到93.3dB.
A digital backstage calibration algorithm for 14bit100MS / s pipeline ADC is proposed.The algorithm uses the pseudo-random signal (PN) to randomly change the threshold voltage of the comparator in the sub-ADC, and indirectly injects the signal with wide amplitude jitter ADC circuit due to the capacitance mismatch and limited amplifier gain error, and in the digital domain to compensate for these errors.This method can effectively reduce the performance of the pipeline ADC due to non-ideal factors such as capacitor mismatch and amplifier gain, Improve the dynamic performance of the ADC. The algorithm does not need to increase the number of sampling capacitors and comparators in the process of the implementation, and does not require complicated calculation in the calibration operation, which is simple and flexible in application. The simulation results show that after the calibration, the signal- From 63.3dB increased to 78.7dB, spurious-free dynamic range from 65.5dB to 93.3dB.