An easy way to conceptualize active filters is thinking about audio speakers. A speaker crossover has a low-pass ... up by analog circuitry. Looking at a square wave through a hi-pass filter.

Analog filters ... various types of analog filters in CMOS technology. One notable advancement is the development of a gain and bandwidth programmable fourth-order low-pass filter specifically ...

Rather than grab a micro, he did it the analog ... pass. Signals with frequency above or below the filter’s passband will be attenuated. The band-pass itself is constructed from a high pass and ...