The switched capacitor filter allows for very sophisticated, accurate, and tuneable analog circuits to be manufactured without using resistors.

What are the advantages of switched capacitor filter over active filter?

Switched-Capacitor Circuit Advantages

This circuit design approach has multiple advantages, including: Saves space while achieving high resistance values. Using actual resistors would require a larger amount of silicon space. Achieve a frequency response accuracy of the order of 0.1% with switched-capacitor filters.

What is the purpose of using capacitor filter?

Generally, a capacitor filters out the signals which have a low frequency. The frequency value of these signals is near to 0Hz, these are also known as DC signals. So this capacitor is used to filter unwanted frequencies.