adctoolbox 0.6.4

ADC Testing and Analysis Toolkit

ADCToolbox

A comprehensive Python toolbox for ADC (Analog-to-Digital Converter) characterization and analysis.

Delivers clear multi-angle diagnostic views of ADC behavior, enabling deeper insight and faster issue location.

Features

• Spectrum Analysis: ENOB, SNDR, SFDR, SNR, THD, Noise Floor
• Error Analysis: PDF, Autocorrelation, Envelope Spectrum, Histogram Analysis
• Jitter Detection: Amplitude vs Phase Noise Decomposition
• Calibration: Foreground Calibration for SAR/Pipeline ADCs
• INL/DNL Extraction: Histogram-based nonlinearity analysis
• 100% MATLAB Parity: Validated against reference MATLAB implementation

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Installation

pip install adctoolbox

or (recommended)

uv pip install adctoolbox

Requirements: Python >= 3.8, numpy, scipy, matplotlib, pandas

Install Codex Skills

After installing adctoolbox, you can install the bundled Codex skill with one command:

adctoolbox-install-skill

This installs:

• adctoolbox-user-guide

Install the maintainer-only skill as well:

adctoolbox-install-skill --dev

Install into a custom skills directory for testing:

adctoolbox-install-skill --dest /tmp/codex-skills

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Quick Start

Spectrum Analysis

from adctoolbox.aout import spec_plot
import numpy as np

# Load ADC output data
data = np.loadtxt("adc_output.csv", delimiter=',')

# Analyze spectrum and get performance metrics
ENoB, SNDR, SFDR, SNR, THD, pwr, NF, _ = spec_plot(data)

print(f"ENOB: {ENoB:.2f} bits")
print(f"SNDR: {SNDR:.2f} dB")
print(f"SFDR: {SFDR:.2f} dB")

Sine Wave Fitting

from adctoolbox.common import sine_fit

# Fit sine wave and extract parameters
data_fit, freq, mag, dc, phi = sine_fit(data)
err = data - data_fit

print(f"Frequency: {freq:.6f}")
print(f"Magnitude: {mag:.4f}")
print(f"DC offset: {dc:.4f}")
print(f"Phase: {phi:.2f} deg")

Jitter Analysis

from adctoolbox.aout import err_hist_sine

# Extract jitter from error histogram
emean, erms, phase, anoi, pnoi, err, xx = err_hist_sine(
    data, bin=99, fin=freq, disp=0
)

# Calculate jitter RMS (assuming input frequency Fin in Hz)
jitter_rms = pnoi / (2 * np.pi * Fin)
print(f"Jitter RMS: {jitter_rms*1e15:.2f} fs")

Error PDF Analysis

from adctoolbox.aout import err_pdf

# Analyze error distribution
noise_lsb, mu, sigma, KL_div, x, fx, gauss = err_pdf(err)

print(f"Noise RMS: {noise_lsb:.4f} LSB")
print(f"Mean: {mu:.4f} LSB")
print(f"Std Dev: {sigma:.4f} LSB")
print(f"KL Divergence: {KL_div:.4f}")

INL/DNL Extraction

from adctoolbox.aout import inl_sine

# Extract INL and DNL from sine histogram
INL, DNL, code = inl_sine(data)

print(f"Max INL: {np.max(np.abs(INL)):.4f} LSB")
print(f"Max DNL: {np.max(np.abs(DNL)):.4f} LSB")

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Available Tools

Spectrum Analysis (adctoolbox.aout)

• spec_plot - FFT spectrum with ENOB, SNDR, SFDR, SNR, THD, noise floor
• spec_plot_phase - Phase spectrum with polar plot
• tom_decomp - Thompson decomposition (deterministic vs random error)

Error Analysis (adctoolbox.aout)

• err_pdf - Error PDF with KDE and Gaussian fitting
• err_hist_sine - Histogram-based error analysis with jitter detection
• err_auto_correlation - Error autocorrelation function
• err_envelope_spectrum - Envelope spectrum via Hilbert transform
• inl_sine - INL/DNL extraction from sine histogram

Common Utilities (adctoolbox.common)

• sine_fit - Multi-parameter sine fitting with auto frequency search
• find_bin - FFT bin finder with sub-bin resolution
• find_fin - Input frequency finder
• alias - Frequency aliasing calculator
• cap2weight - Capacitor array to weight conversion

Calibration (adctoolbox.dout)

• fg_cal_sine - Foreground calibration using sinewave
• overflow_chk - Overflow detection and validation

Oversampling (adctoolbox.oversampling)

• ntf_analyzer - Noise Transfer Function analysis

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Package Structure

adctoolbox/
├── aout/           # Analog output analysis
├── common/         # Common utilities
├── dout/           # Digital output calibration
├── oversampling/   # Oversampling analysis
└── utils/          # Utility functions

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Documentation

• GitHub Repository: https://github.com/Arcadia-1/ADCToolbox
• Full Documentation: See GitHub repository for complete guides
• API Reference: Comprehensive docstrings in all modules
• Test Suite: 15 unit tests with 100% MATLAB-Python parity validation

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Validation

Tested against MATLAB reference implementation:

• 15 Python unit tests
• 96 comparison test cases
• 100% numerical parity achieved
• Results: 27 PERFECT + 51 EXCELLENT + 13 GOOD + 5 ACCEPTABLE

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Example Use Cases

• ADC Characterization: Measure ENOB, SNDR, SFDR for performance verification
• Jitter Analysis: Separate amplitude noise from phase noise/jitter
• Nonlinearity Testing: Extract INL/DNL using sine histogram method
• Calibration: Foreground calibration for SAR and pipeline ADCs
• Error Diagnosis: Multi-view error analysis (time, frequency, phase domains)
• Research: ADC algorithm development with validated reference implementation

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License

MIT License - See LICENSE for details.

Citation

If you use this toolbox in your research, please cite:

@software{adctoolbox2025,
  author = {Zhang, Zhishuai and Jie, Lu},
  title = {ADCToolbox},
  year = {2025},
  url = {https://github.com/Arcadia-1/ADCToolbox}
}

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Authors

Zhishuai Zhang, Lu Jie

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Contributing

Contributions welcome! Please visit the GitHub repository for contribution guidelines.

Development Setup:

git clone https://github.com/Arcadia-1/ADCToolbox.git
cd ADCToolbox/python
pip install -e .[dev]
python tests/run_all_tests.py

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Links

• GitHub: https://github.com/Arcadia-1/ADCToolbox
• Issues: https://github.com/Arcadia-1/ADCToolbox/issues
• MATLAB Version: Also available in the same repository