Ecosyste.ms: Awesome
An open API service indexing awesome lists of open source software.
https://github.com/dragonman225/opamp-generator
Generate folded-cascode opamp parameters with interactive CLI.
https://github.com/dragonman225/opamp-generator
analog-ic-design eda ic-design integrated-circuits
Last synced: 3 months ago
JSON representation
Generate folded-cascode opamp parameters with interactive CLI.
- Host: GitHub
- URL: https://github.com/dragonman225/opamp-generator
- Owner: dragonman225
- Created: 2019-04-11T15:21:10.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2021-05-08T13:13:39.000Z (over 3 years ago)
- Last Synced: 2023-03-05T05:27:52.557Z (almost 2 years ago)
- Topics: analog-ic-design, eda, ic-design, integrated-circuits
- Language: JavaScript
- Size: 44.9 KB
- Stars: 4
- Watchers: 1
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# CMOS Folded-Cascode OpAmp Generator
### Disclaimer
* This is experimental.
* This tool does not always generate working opamp parameters.
* According to my test results, users still need quite much knowledge in analog IC design to make the generated parameters work well.
* The value of this tool may be saving hand calculation time.
### Usage
1. Install `Node.js` and `git`.
2. Open a terminal, enter the following commands (the same on Windows, Linux, macOS).
Clone the repository
```bash
git clone https://github.com/dragonman225/opamp-generator.git
```
Go into the directory
```bash
cd opamp-generator
```
Install Javascript libraries
```bash
npm install
```
3. Edit `src/config.yml`. Change the process dependent parameters and performance specifications.
4. Start the interactive generator
```bash
npm run start
```
* Check below for instance names of the MOSFETs.
### Advanced Stuff
##### Using lambda lookup table
> To consider channel-length modulation and get optimized MOSFET sizes, a lambda lookup table is needed. However, since the relationship of lambda and gate length is process-dependent, I do not provide my lookup table here. You need to do a simulation using your process model and save the lambda v.s. gate length curve as a compatiple CSV file described below, then edit the config to import.
1. Make your CSV file look like this. It can contain arbitrary rows of data.
```
length,lambda_n,lambda_p
1.8E-07,0.6,0.4
1.9E-07,0.58,0.36
2E-07,0.55,0.33
```
* `length` is gate length in meters. `lambda_n` is lambda of NMOS. `lambda_p` is lambda of PMOS.
* Hints :
* `lambda = 1 / (Id * ro - Vds)`.
* Do simulation with given Id, Vds, and measure ro to get lambda. You can sweep through a range of gate length, and plot the results.
* To maintain Id at different gate length, W/L ratio need to be constant, so width should also change with gate length.
* Export the plotted NMOS and PMOS curves as CSV, and use Microsoft Excel or LibreOffice Calc to combine them, also change the column names.
2. Open `src/config.yml`, edit the `lambda_table` property. Change its value to your path. Absolute path is recommended.
```yaml
lambda_table: your_csv_lookup_table.csv
```
##### Concepts of Design Procedure
Please see presentation file : https://slides.com/aic999/deck