An electronic circuit that reduces a narrow range of frequencies. A notch filter is a type of bandstop filter. For example, in a musical instrument amplifier, a notch filter may reduce the frequencies ...

Active notch filters have been used in the past for applications like elimination of 50- and 60-Hz hum components. They have proven to be somewhat problematic from the standpoints of center frequency ...

An apodized discrete layer thickness design method for notch filters is presented. The method produces error tolerant designs with low ripple in the pass band regions ...

A notch for a narrow frequency band of a few per cent or even less normally requires close-tolerance components. At least, that’s what we thought until we came across a special opamp IC from Maxim. In ...