What is the characteristics of passive filter circuits??

Question

What is the main role that the frequency plays in passive filter circuits?

Answer 1

Passive circuits can amplify what they can't do is provide power gain.

Consists of L,C,R and transformers.

Consume zero power when not in use.

can be sensitive to component tollerances.

can be expensive.

can be bulky.

The response of the circuit is usually expressed as a graph against frequency.

Answer 2

A passive filter is one that contains no amplification element, i.e. just capacitors and inductors.
There are filters that do contain operation amplifiers, for instance. These are called active filters.
A filter is a device which adjusts the frequency response of a circuit. Here are a few basic types:

Low Pass - Allows through lower frequencies and attenuates higher ones.
High Pass - Allows through higher frequencies and attenuates lower ones.
Band Pass - Allows through a particular band of frequencies but attenuates those lower and higher.
Band Stop - Allows through frequencies lower and higher than a particular band of frequencies which are attenuated.

Answer 3

a passive filter is a combination of Rs, Cs, and Ls arranged such that it acts as a frequency discriminator, that is, passes some frequencies and rejects others. wikipedia: 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). Since most filters are linear, in most cases, passive filters are composed of just the four basic linear elements -- resistors, capacitors, inductors, and transformers. More complex passive filters may involve nonlinear elements, or more complex linear elements, such as transmission lines. Television signal splitter consisting of a passive hi-pass filter (left) and a passive low-pass filter (right). 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 Passive filters scale better to large signals (tens of amps, hundreds of volts), where active devices are often impractical No power consumption (aside from possibly taking some power out of the signal) Inexpensive For linear filters, generally, more linear than filters including active (and therefore non-linear) elements They are commonly used in speaker crossover design (due to the moderately large voltages and currents, and the lack of easy access to power), filters in power distribution networks (due to the large voltages and currents), power supply bypassing (due to low cost, and in some cases, power requirements), as well as a variety of discrete and home brew circuits (for low-cost and simplicity). Passive filters are less common in integrated circuit design, where active devices are comparatively inexpensive compared to resistors and capacitors, and inductors are prohibitively expensive.

Answer 4

The max gain of the circuit is 1.

You need to have very high Qfactor passive elements to have a large bandwidth.

Answer 5

I imagine one that does not amplify the signal