ELECTRONICS
Second-Order Butterworth Low-Pass Filter
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CASE ANALYSIS
Scenario
Designing a maximally flat two-pole low-pass filter for audio or sensor signal conditioning.
Key decisions
- Use equal source and load termination (1kΩ) for Butterworth response
- Choose L=22.5mH and C=22.5nF for 10 kHz cutoff
When to reuse this
When a simple, passive second-order low-pass filter is acceptable and no gain is required.
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circuit-second-order-butterworth-low-pass-filter-with-labeled-input-