文档介绍：Electronic filters are electronic circuits which perform signal processing functions, specifically to remove unwanted ponents from the signal, to enhance wanted ones, or both. Electronic filters can be passive or active.
A passive filter is a kind of electronic filter that is made only from passive elements - in contrast to an active filter, it does not require an external power source (beyond the signal). most filters are linear. in most cases, passive filters posed of just the four basic elements - resistors, capacitors, inductors, and transformers. plex passive filters may nonlinear elements, or plex linear elements, such as transmission lines.
Television signal splitter consisting of a passive high-pass filter and a passive low-pass filter. The antenna is connected to the screw terminals to the left of center.
A passive filter has several advantages over an active filter:
Guaranteed stability .
Scale better to large signals (tens of amperes, hundreds of volts), where active devices are often impractical
No power supply needed
Often less expensive in discrete designs (unless large coils are required)
For linear filters, potentially greater linearity depending ponents required
They monly used in speaker crossover design (due to the moderately large voltages and currents, and the lack of easy access to a power supply), filters in power works (due to the large vol