How do I install the Five Transistor Ota skill?

Run npx skillmds@latest add arcadia-1/five-transistor-ota in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Five Transistor Ota safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Five Transistor Ota?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Five Transistor Ota free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Five Transistor Ota?

arcadia-1 (@arcadia-1) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Five Transistor Ota by arcadia-1 — Agent Skill

Name: Five Transistor Ota
Author: arcadia-1

Five Transistor Ota

Five-transistor OTA simulation and analysis skill. Use when the user wants to simulate or size a classic 5T CMOS OTA: NMOS differential input pair, PMOS current-mirror active load, and NMOS tail current transistor. Supports ngspice DC transfer, AC gain/bandwidth/phase, output-noise analysis, and first-order design interpretation. Requires ngspice on PATH and Python 3 with numpy/matplotlib/scipy.

arcadia-1 Updated Sep 17, 2026

File contents

Five-Transistor OTA Skill

Classic single-ended 5T CMOS OTA using PTM 180nm models.

Topology

             VDD
              |
       M3 PMOS mirror output      M4 PMOS diode load
              |                         |
             OUT                       NETD
              |                         |
       M0 NMOS input +           M1 NMOS input -
              \_______________________/
                         |
                        TAIL
                         |
                M5 NMOS tail source
                         |
                        VSS

Ports: INP, INN, OUT, VDD, VSS, VBIAS.

Running

cd five_transistor_ota/scripts
python run_ota.py

This runs:

DC transfer curve around the input common-mode point.
AC open-loop gain from differential input to output.
Output-referred noise density and integrated RMS noise.

Outputs go to WORK/plots, WORK/logs, and WORK/netlists.

Main Scripts

Task	Script
Full simulation	`run_ota.py`
DC only	`run_ota_dc.py`
AC only	`run_ota_ac.py`
Noise only	`run_ota_noise.py`

Design Knobs

Edit scripts/ota_common.py:

W_IN_UM, L_IN_NM, M_IN — input pair sizing.
W_LOAD_UM, L_LOAD_NM, M_LOAD — PMOS mirror load sizing.
W_TAIL_UM, L_TAIL_NM, M_TAIL — tail transistor sizing.
VBIAS — tail gate bias.
C_LOAD and R_LOAD — output loading.

Frequently asked questions