Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/vibeic/vibe-icnpx agentmods add skills/vibeic/vibe-ic/analog-sizingWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vibeic/vibe-ic/analog-sizing)<a href="https://agentmods.dev/skills/vibeic/vibe-ic/analog-sizing"><img src="https://agentmods.dev/badge/skills/vibeic/vibe-ic/analog-sizing/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vibeic/vibe-ic/analog-sizing"><img src="https://agentmods.dev/badge/skills/vibeic/vibe-ic/analog-sizing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00062 | $0.01625 |
| Opus 5 | $0.00031 | $0.00813 |
| Sonnet 5 | $0.00012 | $0.00325 |
| Haiku 4.5 | $0.00006 | $0.00162 |
Grade A, and why
analog-sizing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Analog Sizing
Given an analog topology (schematic or netlist) and a performance spec (gain, UGB, phase margin, noise, power, area), propose transistor W/L sizes and bias currents that meet the spec. Acts as the LLM copilot layer over classical analog sizing tools and SPICE.
When to use
Trigger when the user:
- Has a schematic (op-amp, LDO, bandgap, comparator, PLL CP) and needs sizes
- Wants to explore a design space before running SPICE sweeps
- Asks for gm/Id-based sizing intuition
- Needs a starting point for an optimizer
Inputs to gather
- Topology (schematic, netlist, or textual description)
- Process and models (e.g., TSMC 180nm, 65nm, FinFET node)
- Spec table: gain (dB), UGB (Hz), PM (°), noise, power budget, supply, load
- Starting point or "greenfield"
- Constraint: minimize power, minimize area, or balanced
The process constants are MEASURED, not re-derived here (vibe-ic#1962)
Do not derive k', the threshold, the resistor sheet or the MiM density by hand, and do not quote them from memory. They are a deterministic measurement of the target PDK's own models, taken once and published with their provenance:
# read what has already been measured for the target family
python3 plugins/vibe-ic/programs/pdk_analog_device_params.py --pdk <family>
# measure (or refresh) a family that carries no record yet
python3 plugins/vibe-ic/programs/pdk_analog_characterize.py \
--pdk <family> --container vibeic-eda --corners typ,slow,fast
The record lives under each PDK entry's analog_device_params.measured in
programs/pdk_registry.json — or, for a PDK STAGED INTO the design (which may
not be publishable), under analog/_pdk_char/analog_device_params.json in the
project, which outranks the shipped record. What it gives you, per corner:
| constant | what it is |
|---|---|
k_prime_n_ua_per_v2 / k_prime_p_ua_per_v2 |
µ·Cox, from a two-point square-law fit in saturation |
vth_n_extracted_v / vth_p_extracted_v |
the threshold THAT fit implies, which is not the model card's Vth0 |
vgs_at_id_n_v / vgs_at_id_p_v |
the gate drive a stated current buys in a stated geometry — the bias-chain handle |
rsheet_ohm_per_sq, r_end_ohm, r_per_um_ohm |
the resistor sheet, and the end/contact term a single-device measurement hides in it |
cap_area_ff_per_um2, cap_perim_ff_per_um |
the capacitance density, and the fringe a single-plate measurement hides in it |
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago Changed · +45 lines 3f20c229c71f
- 9d ago First seen · 93 lines · 62 tokens per session scan A cd8b1570b693
analog-sizing is a skill published in the GitHub repository vibeic/vibe-ic (23 stars, last pushed today), licensed Apache-2.0. It adds 62 tokens to every session and 1,625 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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