load-capacitor-assistant

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load-capacitor-assistant

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Assists in picking out appropriate load capacitors for MHz or kHz pierce oscillator circuits.

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# Load Capacitor Assistant

A tool that assists board design engineers in selecting appropriate load capacitors for MHz or kHz pierce oscillator circuits.

![Output Example](https://raw.githubusercontent.com/rthomp10/load-capacitor-assistant/main/bin/images/output.png)

## About

This tool helps ensure that the gain margin (safety factor) and frequency tolerance of a crystal are within project constraints. It performs the necessary calculations based on crystal parameters from the datasheet and the measured frequency from the board.

## Requirements

- Python with Jupyter Notebook
- NumPy
- Matplotlib

## Installation

```bash
# Install dependencies from requirements.txt
pip install -r requirements.txt
```

## Usage

Run the notebook:
```bash
jupyter notebook cl-vs-freq.ipynb
```

Enter your crystal parameters in the notebook:
- `fs`: Series resonant frequency
- `cm`: Motional capacitance
- `c0`: Shunt capacitance
- `cl_nominal`: Nominal load capacitance from datasheet
- `c1c2`: Current capacitors on customer schematic
- `f_customer_board`: Measured frequency on-board

The notebook will output:
- Recommended C1=C2 capacitor values
- Board stray capacitance estimate
- Trim sensitivity, anti-resonant frequency, and motional parameters
- Visual plots showing CL vs frequency relationships
- Text file (`output.txt`) with all calculated parameters

## License

GPL License - See `LICENSE` for details

## Contact

Ryan Thompson - [@rthomp10](https://www.linkedin.com/in/rthomp10/)

Project Link: [https://github.com/rthomp10/load-capacitor-assistant](https://github.com/rthomp10/load-capacitor-assistant)

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