Pole Zero Cancellation

When a step function input goes through a network of two CR filters the resulting signal is bipolar. One way to remove the bipolar signal and make the output unipolar is to use zero pole cancellation. Zero pole cancellation is implemented by using a parallel reistance with last capacitor. https://www.ortec-online.com/-/media/ametekortec/other/amplifier-introduction.pdf?la=en