barry0107
Newbie level 6
Hi,
There is a quick question about ADCs testing results. Usually a publish paper shows a plot, SNDR(dB) vs. input signal frequency. Sometimes input signal frequency will be larger than the Nyquist-Rate frequency, and the SNR just drops slightly.
For example, Devarajan, S., "A 16b 125MS/s 385mW 78.7dB SNR CMOS pipeline ADC", ISSCC, 2009. The Figure 4.7.6 shows sample rate is 125MS/s, the input signal frequency increases from 10MHz to 300MHz, and the SNDR drops slightly. Why doesn't the SNDR drop rapidly?
BR,
Barry
There is a quick question about ADCs testing results. Usually a publish paper shows a plot, SNDR(dB) vs. input signal frequency. Sometimes input signal frequency will be larger than the Nyquist-Rate frequency, and the SNR just drops slightly.
For example, Devarajan, S., "A 16b 125MS/s 385mW 78.7dB SNR CMOS pipeline ADC", ISSCC, 2009. The Figure 4.7.6 shows sample rate is 125MS/s, the input signal frequency increases from 10MHz to 300MHz, and the SNDR drops slightly. Why doesn't the SNDR drop rapidly?
BR,
Barry