I have the output codes of the pipelined ADC,and how do I use these codes to create the input signal?? May I use the G-element??? Or someone has better ways to get the original signal??
Use a DAC that has higher resolution than your designed ADC. That's how ADC is characterized i the labs. Use DAC to recover your input signal and analyze it. Another way, is to use MATLAB or some other DSP program to look at your ADC output. Take a snapshot of the ADC output (small amount of data) and FFT it using MATLAB.