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提出了一种针对流水线模数转换器(ADC)级间残差放大器的线性增益偏差与增益压缩误差的后台补偿方法.利用随机信号的二阶统计互相关特性,通过在第一级数模转换器输入端的低两位上分次注入数字伪随机序列,测量放大器的实际增益值与其表征幂级数模型的三阶非线性项系数,并使用此估计值同时完成对这两种误差的后台补偿.为了验证设计,对14位三级流水线ADC进行了系统模拟,当前两级量化精度均为5位,且两级残差放大器的增益偏差与输出峰值点的相对增益压缩率分别为-2%和5%时,经过补偿后SFDR(无杂散失真动态范围)和SNDR(信噪失真比)指标分别从70.93dB和54.83dB提高到97.60dB和74.30dB.
A background compensation method for the linear gain error and gain compression error of a stage-to-line residual error amplifier (ADC) is proposed. By using the second-order statistical cross-correlation of random signals, The lower two bits of the input end of the digital sub-sequence of pseudo-random sequence of injection, measuring the actual gain of the amplifier and its characterization of the power series of third-order nonlinear coefficients, and the use of this estimate of the two errors at the same time to complete background compensation In order to validate the design, 14-bit three-stage pipeline ADC was systematically simulated, the current two levels of quantization accuracy are 5, and the two-stage residual amplifier gain deviation and output peak point relative gain compression rate were -2% And 5%, the index of SFDR (Spurious Free Dynamic Range) and SNDR (Signal to Noise Distortion Ratio) increased from 70.93dB and 54.83dB respectively to 97.60dB and 74.30dB after compensation.