KiCAD and SPICE : Design and Simulate a Band-Pass Filter!

Exploring the Capabilities of Keycard Software for Electronic Design
Introduction to Keycard Software
Welcome back! In this video, we delve into the versatile and powerful Keycard software, an open-source tool for electronic design. Over the past few weeks, we have leveraged this software to create various sockets and perform numerous analyses using real-world hardware. Our journey has encompassed the use of SPICE models for a range of electronic components and devices, facilitating the design, simulation, and analysis of multiple electronic circuits.
SPICE Models and Integrated Circuits
If you're new here, we recommend reviewing our previous models to understand how we've integrated SPICE with Keycard. Today, we focus on another SPICE capability: handling integrated circuits (ICs) that house multiple components. For instance, the TL072 operational amplifier contains two separate op-amps within a single 8-pin package.
Designing with Multiple Components in a Single IC
When your schematic requires both parts of an IC, such as two operational amplifiers, the approach involves treating them as distinct entities while acknowledging their shared housing. For example, on the screen, you can see two operational amplifiers used in a band-pass filter design. Both amplifiers are part of the TL072 IC, a detail you can verify by looking up the component's datasheet online.
Building a Band-Pass Filter
We will demonstrate the design and simulation of a band-pass filter using the Sallen-Key topology. This filter combines a high-pass and a low-pass filter. Previously, we covered the Sallen-Key topology for second-order active filters, including both low-pass and high-pass configurations. Today, we will combine these filters to create a band-pass response.
Schematic Setup in Keycard
To add components in Keycard, use the "Add Symbol" feature and select components like the TL072 from the library. For example, after typing "TL072" in the search box, you'll find the dual low-noise JFET-input operational amplifier. Placing the components in your schematic involves selecting the desired parts and positioning them appropriately.
SPICE Model Integration
For accurate simulation, integrating a SPICE model is crucial. Download the SPICE model for TL072 from the manufacturer's website and include it in your project. Ensure the model file is correctly mapped to your schematic pins, accounting for both op-amps in the IC. The inclusion process involves specifying the file and assigning the appropriate pins.
Simulation and Analysis
Once the circuit design is complete, perform an Electrical Rule Check (ERC) to ensure there are no errors. Open the simulation settings, configure the analysis parameters, and run the simulation. For this demonstration, we focus on AC analysis, setting the start and stop frequencies to capture the band-pass behavior.
Conclusion
Through this tutorial, you will gain a deeper understanding of using Keycard software and SPICE models to design, simulate, and analyze complex electronic circuits. By combining theoretical knowledge with practical application, you can create efficient and accurate designs for real-world implementation.
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[@AllenSA_Lily]

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[@stemscience1]

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