Description of Filters - Active

Active filters are used to get rid of unwanted frequencies and signals in a circuit. They do this by combining passive components (like resistors and capacitors) with amplifying components. There are several types of active filters, including:

Antialiasing: Prevents distortion in signal processing.

Band Pass: Allows a certain range of frequencies to pass through while blocking others.

Bessel: Known for its smooth response and minimal signal distortion.

Butterworth: Offers a flat frequency response in the passband.

Cauer: Also called Elliptic filters, they provide a sharp cutoff and minimal ripple.

Continuous Low Pass: Filters out high frequencies while allowing low frequencies to pass.

Digital: Used in digital signal processing.

Elliptic Band Pass: Combines sharp cutoff with low ripple.

FIR (Finite Impulse Response): A type of digital filter with a finite duration impulse response.

Half Band: Special type of FIR filter with reduced computational complexity.

Linear Phase: Maintains the phase relationship between frequency components.

Low Pass: Lets low frequencies pass through while blocking high frequencies.

Ripple: Refers to the variation in the filter's passband response.

SD/ED/HD (Standard Definition/Enhanced Definition/High Definition): Used in video applications.

Serial I/O: Deals with serial data communication.

Universal: Can be adjusted to different filter characteristics.

Variable: Allows for changes in the filter's frequency range.

These filters can handle frequencies ranging from 2 kHz to 6.9 GHz.