39 MoM capacitor
39 : MoM capacitor
- Author: htfab
- Description: Simple metal-oxide-metal capacitor for gf180mcuD that fills an analog 1x2 tile
- GitHub repository
- Open in 3D viewer
- Clock: 0 Hz
How it works
Implements a simple interdigitated metal-oxide-metal capacitor:
The repo contains both a script to generate a custom size capacitor and a fixed instance filling a Tiny Tapeout analog slot (1x2 tiles).
How to test
Measure the capacitance between terminals A and B.
You can use the dummy terminals to control for parasitic capacitance on the path between your probes and the project pins.
For comparison, magic's circuit extraction estimates the capacitance at around 85 pF.
External hardware
Test equipment (function generator + oscilloscope, or VNA).
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | |||
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B6 | 12 | capacitor terminal A |
| 1 | B7 | 13 | capacitor terminal B |
| 2 | B8 | 14 | dummy terminal |
| 3 | B9 | 15 | dummy terminal |