Analyze AMS Waveforms — Mixed-Signal Blockset Utilities

Analyze AMS Waveforms — Mixed-Signal Blockset Utilities

Analyze waveform data using msblksutilities functions from the Mixed-Signal Blockset. Covers timing, phase noise, jitter, lock time, resampling, INL/DNL, ADC/DAC calibration, and HSpice data import.

When to Use

• Measuring phase noise from time-domain VCO/PLL simulation output
• Computing period jitter or cycle-to-cycle jitter from clock signals
• Resampling non-uniform (variable-step solver) data to a uniform grid
• Measuring rise/fall time, duty cycle from digital waveforms
• Computing INL/DNL for ADC/DAC characterization
• Importing HSpice simulation results (.tr0, .ac0, .sw0)
• Converting a phase noise profile to integrated RMS jitter

When NOT to Use

• Spectral analysis with Signal Processing Toolbox (FFT, PSD, spectrogram) — use SPT directly
• Signal quality metrics (SNR, SINAD, THD, SFDR) — use SPT functions (snr, thd, sfdr, sinad) directly
• Filtering or envelope detection — use Signal Processing Toolbox directly
• Uniformly-sampled data that doesn't need anti-aliased resampling

Workflow Directive: Phase Noise Parameter Gathering

When the user asks to measure phase noise from waveform data, ask for frequency offset points before proceeding:

1. Ask: "At which frequency offsets would you like to measure phase noise? Default: [10e3, 100e3, 1e6, 10e6] Hz — press Enter to use these or specify your own."
2. Once offsets are confirmed, propose RBW based on the lowest offset: RBW = min(offsets) / 2 (e.g., 5 kHz for 10 kHz lowest offset). State: "I'll use RBW = X Hz (lowest offset / 2). Let me know if you'd like a different value."
3. Proceed with measurement unless the user overrides.

This ensures the measurement matches the user's application without requiring