This article is part of the Ideas for Design Series: Volume 3

The Volume 3, No. 9 issue of Ideas for Design features:

• A method to implement a bandpass filter with a clock, instead of a switched-capacitor filter, for communications applications with MCUs that may lack a needed timing device. 
• An approach that uses the continuity of states and steady-state "wrap-around" concept to provide accurate steady-state output results for an RC filter driven by a PWM pulse train.

These links are to the articles, while the Download button provides access to the PDF of the article:

• Build Your Own RC-Programmable Wide-Bandwidth Bandpass Filter For Comm Applications
• Accurately Determine Steady-State Output For A Periodically Driven RC Filter