SAME Analog Modular Ecosystem Specification

The SAME Analog Modular Ecosystem is an open-hardware specification and architecture for general-purpose analog computing. Designed for technological sovereignty, 50-year serviceability, and high-precision scientific computation, SAME bridges classical analog architectures with modern low-noise components and rigorous topological error compensation.

Key Features

Multi-Tiered Precision: Defines three distinct operational tiers sharing a unified power and backplane infrastructure:
Metrologic Tier: $0.001\%$ (10 ppm) precision, $90\text{ dB}$ SNR, $<0.014\text{ ppm/h}$ drift.
Industrial Tier: $0.01\%$ (100 ppm) precision, $80\text{ dB}$ SNR, $<0.6\text{ ppm/h}$ drift.
Educational Tier: $0.1\%$ (1000 ppm) precision, $70\text{ dB}$ SNR, $<60\text{ ppm/h}$ drift.
Robust Mechanical Infrastructure: Individual $1.2\text{ mm}$ DC01 steel shielding cassettes ($4\text{U}$ height, $38.0\text{ mm}$ width) housed in a standard $19\text{"}$ rack enclosure with integrated convective ventilation and EMI perimeter masking.
Unified Power & Clocking: DB-25 backplane distributing $\pm15.00\text{ V}$ analog, $\pm5.0\text{ V}$ digital, $\pm10.0000\text{ V}$ Kelvin-sensed reference rails, a $90^\circ$ phase-stagger rail, and a system-wide $10\text{ MHz}$ OCXO Master Oscillator for Pulse-Width Amplitude Modulation (PWAM) compute cores.
Executable Specification: Built natively in Typst, featuring compile-time mathematical assertions (#assert-aeq) embedded directly alongside typeset equations to guarantee zero-copy consistency throughout the text.

Repository Structure

.
├── charts/                     # Vector charts built with CeTZ-plot
├── diagrams/                   # Vector technical drawings & CAD layouts (CeTZ / Zap)
├── lib/                        # Executable Typst helper functions & test harness
│   ├── apply-prefix.typ        # SI prefix mathematical helper
│   ├── assert-aeq.typ          # Float tolerance assertion library
│   └── unify.typ               # Curried unit formatting wrappers
├── listings/                   # Code examples and calibration log templates
├── tables/                     # Modular specification data tables
├── electrical-specifications.typ
├── mechanical-specifications.typ
├── module-design.typ           # Theoretical error budgeting & compensation
├── introduction.typ
├── preamble.typ                # Document entry point & main layout
└── LICENSE.md                  # Comprehensive tri-license legal breakdown
└── LICENSES                    # Actual licences text

Compiling the Specification

Prerequisites

Typst CLI (v0.15.1 or newer)
Fonts: standard system serif ans sans-serif fonts

Building the PDF

To compile the entire specification from source:

typst compile preamble.typ specification.pdf

To enable live-recompilation during drafting:

typst watch preample.typ

Note: During compilation, Typst executes all internal assertions metrology checks. If any mathematical derivation or parameter in the text strays from defined engineering tolerances, compilation will halt with an assertion error.

Licensing

This repository uses a multi-scope licensing model to ensure appropriate legal coverage across documentation, physical hardware, and executable code:

Documentation & Text: CC BY-SA 4.0
Hardware & Mechanical Designs: CERN-OHL-S-2.0+
Code, Libraries & Assertions: GPL-3.0-or-later

See LICENSE.md or full license texts.

Author & Contact

Denis Chevalier

Email: perso@denischevalier.fr