Hi: I need to record a two analog signals, by using an ADC(of 20 bits resolution or higher), the two signals are very weak signals of signal to noise ratio about -30 db, so the two signals are very effective by the noise. the problem is : how to record these two signals at the same time(simultaneous )? If i will use multiple channel ADC, then the two signals will be sampled not at the same time exactly, because the ADC of multiple channels use the multiplexing to sampling multiple channels. so, how can i record(by using ADC) the two signals at the same time exactly??