🔊 Sallen-Key Band-Pass Filter (Active Filter)

Design and simulation of a second-order active band-pass filter using LTspice

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📌 Overview

This project demonstrates the design and simulation of a second-order Sallen-Key Band-Pass Filter using LTspice.

A band-pass filter allows signals within a specific frequency range to pass while attenuating frequencies outside this range.

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⚙️ Circuit Description

The circuit is implemented using an operational amplifier to achieve an active band-pass response.

It is designed to:

• Reject low-frequency signals
• Pass mid-frequency signals
• Attenuate high-frequency signals

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🧪 Simulation Details

• Software: LTspice
• Analysis: AC Sweep (.ac dec)
• Frequency Range: 100 Hz – 100 kHz

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📈 Circuit Diagram

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📉 Output Waveform

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📝 Design Notes & Calculations

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📊 Observations

• Output is low at low frequencies
• Maximum gain occurs in mid-frequency range
• Output decreases at high frequencies
• Clear band-pass response is observed

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🎯 Applications

• Audio filtering
• Communication systems
• Signal processing

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📂 Project Files

• LTspice simulation file (.asc)
• Project report (DOCX)
• Circuit and waveform images
• Design notes

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📚 Reference

R. L. Boylestad and L. Nashelsky, Electronic Devices and Circuit Theory, 11th ed., Pearson, 2013.

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🧑‍💻 Author

THANGAVIKRAMAN RAMACHANDRAN
B.E Electronics and Communication Engineering

🔗 LinkedIn: https://www.linkedin.com/in/thangavikraman-ramachandran/