Spectral Impact of Mismatches in Interleaved ADCs
This work addresses performance issues in high-speed ADCs for applications requiring multi-GS/s rates, but it is incremental as it builds on existing mismatch analysis.
The paper tackled the problem of performance limitations in interleaved ADCs due to mismatches, by proposing exact expressions to describe their spectral impact and deriving the distribution of induced spurs and replicas for yield-oriented specifications, with a practical example for calibration step sizes under target yield constraints.
Interleaved ADCs are critical for applications requiring multi-gigasample per second (GS/s) rates, but their performance is often limited by offset, gain, and timing skew mismatches across the sub-ADCs. We propose exact but compact expressions that describe the impact of each of those non-idealities on the output spectrum. We derive the distribution of the power of the induced spurs and replicas, critical for yield-oriented derivation of sub-ADC specifications. Finally, we provide a practical example in which calibration step sizes are derived under the constraint of a target production yield.