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Questions of the plot, SNR vs. input signal frequency.

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barry0107

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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
 

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