Circuits & Systems Classroom
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Time-interleaved ADCs

Time domain998.5 MHz input · four channel turns shown
−0.50.00.50123input and channel samples, V012243647 samples
Output spectrum4096-point FFT · 10 GS/s · rectangular SFDR 49.3 dB · SNDR 43.6 dB
−120−100−80−60−40−2000 Hz2.5 GHz5 GHzdBFSH2H3H5H7
Where each imperfection appearssame frequency axis as the FFT above
0 Hz2.5 GHz5 GHzOffsetfixed tones at k·fs/M−49.2 dBcGaincopies around k·fs/M−55.0 dBcTiming skewsame copies, rising with fin−64.5 dBcBandwidthfrequency-dependent gain and phase−52.3 dBcHarmonicsH2, H3, H5, H7 after folding−65.0 dBcH2H3/H7H5Jitterbroadband phase-noise floor50.1 dB SNR