About this manual
This document presents two methods for simplifying the design of multiple order all-pole bandpass filters. The first method involves cascading non-identical 2nd order sections to create Butterworth and Chebyshev responses, while the second method uses identical 2nd order sections to achieve high Q factors with simpler hardware.
What's inside
- Introduction
- Designing Bandpass Filters
- Cascading Identical 2nd Order Sections
- Hardware Implementation Mode 1
- Hardware Implementation Mode 2
Frequently asked questions
What is the minimum number of resistors required per section for a switched capacitor filter operating in Mode 1?
Only three resistors are required per section when using Mode 1 operation.
What clock frequency accuracy ratio does a typical non-A part design with 1% tolerance resistors achieve?
The clock to center frequency ratio accuracy is better than 1%.
What gain error occurs at the signal frequency if lower cost LTC filters with +0.8% tolerance are used?
The gain error at 150Hz will be 1+ 1.8%.
