This Report is yet to be approved by a Coordinator.
24 / 3 / 2025
Task 1: Cut, Pass and Repeat
Objective: To learn about Band Pass Filters and to design a second order band pass filter using IC747 that amplifies the signal to roughly 1.5 times the original signal of the Cutoff range between 4kHz and 10kHz.
Platform: LTSpice
What is a Bandpass filter?
A bandpass filter is an electronic circuit that allows signals within a specific frequency range to pass through while attenuating frequencies outside this range. A second order filter is used to provide better roll-off rate and is designed by using Opamps, resistors and capacitors. Here, the design is based on Sallen Key topology, which is the most commonly used architecture for second order filters.
Specifications and values
| Specification | Value | |
|---|---|---|
| Passband gain | roughly 1.5 (≈3.5 dB) | |
| Lower cutoff frequency | 4KHz | |
| Upper cutoff frequency | 10KHz | |
| OpAmp | IC747 |
Circuit Diagram
Design Specifications
Output
Passband gain is approximately equal to 1.5 or 3.5dB