An Overview of Filters
Filters are electronic circuits that allow certain frequencies to pass through and reject or attenuate all other frequencies.
Four Types of Active Filters
There are four primary types of active filters, including the low-pass filter, the high-pass filter, the band-pass filter, and the band-stop filter.
- Low-pass Filter: mainly allowing low-frequency signals to pass through the filter.
- High-pass Filter: allowing high-frequency signals to pass through the filter.
- Band-pass Filter: allowing specific frequencies to pass through the filter.
- Band-stop Filter: rejecting or attenuating certain frequencies to enter the filter
What are the differences between Active Filter and Passive Filter?
Passive filters: using passive components such as resistors, capacitors, and inductors only.
- Active filters: including active components like op-amps, resistors, and capacitors, but not inductors.
- Passive filters are most reactive to a frequency range from roughly 100 Hz to 300 MHz. In contrast, Active filters can only deal with very low frequencies (approaching 0 Hz), and they can provide voltage gain while passive filters cannot.
What are the LCSC Categories of Filters?
Switched Capacitor Filters, Clamp Filters (Ferrite Core with Case), Crystal Filters, Active Filters, Ceramic Filters, Common Mode Filters, EMI/RFI Filters (LC, RC Networks), Feed Through Capacitors, Ferrite Beads, Noise Suppressors, EMC Filters