https://www.analog.com/cn/resources/design-notes/switchedcapacitor-ic-forms-notch-filter.html
Switched-capacitor filters (SCFs) are renowned for ease of use. They are accurate, require no external components, and mainta
switched capacitornotch filteranalog devicesforms
https://www.instructables.com/Twin-T-Notch-Band-Reject-Filter/
Twin T Notch Band Reject Filter: A band reject filter is one which does not allow a specific band of frequencies to pass through it. It is also known as Notch...
band reject filtertwinnotchstepsinstructables