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// SAME Analog Modular Ecosystem
//
// / SPDX-FileCopyrightText: 2026 Denis Chevalier <perso@denischevalier.fr>
// / SPDX-License-Identifier: CC-BY-SA-4.0
// / SPDX-License-Identifier: CERN-OHL-S-2.0+
// / SPDX-License-Identifier: GPL-3.0-or-later
//
// The prose, explanatory text, rendered figures, tables, and mathematical
// content of this specification are licensed under CC BY-SA 4.0. If a later
// version of CC BY-SA is published, the author grants permission to distribute
// this work under that later version as well.
//
// Hardware designs contained herein (schematics, PCB layouts, mechanical
// drawings, and CAD models) are licensed under CERN-OHL-S-2.0+.
//
// All executable code, helper libraries (`lib/*`), metrology assertions, and
// embedded verification scripts throughout the source documents are licensed
// under the GNU General Public License v3.0 or later (GPL-3.0-or-later).
#import "../lib/unify.typ": qty, unit
#import "@preview/cetz:0.5.2"
#import "@preview/cetz-plot:0.1.4": plot
#figure(
cetz.canvas({
import cetz.draw: *
plot.plot(
size: (12, 6),
x-label: [Temperature variation $Delta T$ ($unit("celsius")$)],
y-label: [Ratio / gain drift $Delta G / G_0$ ($unit("ppm")$)],
x-min: 0,
x-max: 10,
y-min: 0,
y-max: 100,
x-grid: "minor",
y-grid: "minor",
{
// 10 ppm Metrologic Error Budget Limit
plot.add(
((0, 10), (10, 10)),
style: (
stroke: (paint: luma(120), thickness: 0.8pt, dash: "dash-dotted"),
),
label: [Metrologic budget limit],
)
// Unmatched Discrete Resistors (Delta alpha = 50 ppm/°C)
plot.add(
domain: (0, 10),
samples: 1000,
style: (stroke: (paint: black, thickness: 1.5pt, dash: "solid")),
label: [Unmatched discrete],
t => 50 * t,
)
// Matched Discrete Pair (Delta alpha = 1 ppm/°C)
plot.add(
domain: (0, 10),
samples: 1000,
style: (stroke: (paint: black, thickness: 1.5pt, dash: "dashed")),
label: [Matched discrete pair],
t => 1 * t,
)
// Monolithic Thin-Film Network (Delta alpha = 0.1 ppm/°C)
plot.add(
domain: (0, 10),
samples: 1000,
style: (stroke: (paint: black, thickness: 1.5pt, dash: "dotted")),
label: [Monolithic thin-film],
t => 0.1 * t,
)
},
)
}),
caption: [Gain drift $Delta G / G_0$ as a function of ambient temperature variation $Delta T$, comparing unmatched discrete resistors, matched discrete pairs, and monolithic thin-film networks against the $qty(10, "ppm")$ Metrologic systematic error budget],
) <figure-resistor-ratio-tracking-drift>
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