Update README.md

README.md

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 - 📚 [IHP Open PDK Docs](https://ihp-open-pdk-docs.readthedocs.io/en/latest/)
 - 💬 [IHP Open PDK Discussion on ChatGPT](https://chatgpt.com/g/g-sovooLd0V-ihp-open-pdk)
 
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 ## Module 0 – Foundations
 
 This introductory module sets up the essential tools and methodologies for working with the IHP Open PDK in analog IC design. You'll begin by installing and verifying key tools like Xschem and KLayout, guided by the official documentation. Once installed, you’ll explore basic simulations—including DC, transient, AC, Monte Carlo, and S-parameter analyses—through example test cases provided within the PDK.
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 Whether you're new to IC design or transitioning to an open-source flow, this module ensures your environment is fully prepared for hands-on analog development using the IHP 130nm technology node.
 
 
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 ## Module 1 – Bandgap Reference
 
 In this module, you'll begin your first analog design: an all-CMOS bandgap reference. The module is divided into three parts, guiding you from OTA design to full schematic simulation and layout considerations.
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 ## Module 2 – 50 GHz Medium Power Amplifier
 
 In this module, we take our first steps into the world of **RF design** by developing a **50 GHz Medium Power Amplifier (MPA)** using **QUCS-S** as the schematic editor.
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 > 📌 **Note**: Be sure to consult the slides for this module. It includes additional resources from the developer of the Python–OpenEMS interface for the IHP stackup, not covered in the Markdown file.
 
 
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 ## Module 3 – 8-bit SAR ADC
 
 In the final module, we shift focus to **mixed-signal design** by building a simple yet functional **8-bit Successive Approximation Register (SAR) ADC**. The chosen architecture is a **synchronous SAR**. 
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 > 📌 Be sure to explore both the Markdown and the accompanying slides for this module. Some additional insights and visualizations are included in the slides that aren’t covered in the Markdown material.
 
 
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 ## Final Thoughts
 
 This course emphasizes **key steps in the workflow** for analog, RF, and mixed-signal IC design using open-source tools. While we haven't covered every detail in depth, the aim was to provide a **strong foundation** for navigating the complexities of these workflows. We hope this serves as a good starting point, and that you'll take what you've learned here to explore further on your own.