Hello, friends, I hope you all are doing great. In today’s tutorial, we will discuss the Difference Between Active and Passive Filter. The basic difference between active and passive filters is that for the filtration process in active filter elements like a transistor and operational amplifier is used. In passive filter resistance, an inductor and capacitor are used for signal generation. There is another difference is that for the operation of an active filter exterior power source is required and in the passive filter, there is no need of an exterior power source.
Filters are such circuitry that can pass certain frequency bands and reject frequency outer from that band. These filter circuitry shows the feature of frequency selectivity. In today’s post, we will have a detail look at both active and passive filters and compare them to find their differences. So let’s get started with a Difference Between Active and Passive Filter.
Difference Between Active and Passive Filter
Active Filter
- These circuits belong to the analog circuitry used in active components to work like amplifiers.
- The amplifier used in this arrangement helps to make a good operation with less cost.
- There is another benefit of amplifiers is that they stop the load impedance.
- They come with complicated poles in the absence of costly inductors.
- There are four main types of active filters
- Low pass, high pass, bandpass, and active pass
- It needed an exterior power supply for operation.
- Their circuitry is complicated.
- Their weight is less than the passive filter.
- This filter has a high Q factor.
- This sensitive circuit than the passive circuits.
Passive Filter
- These circuits are constructed with passive elements like resistance, inductor, and capacitor.
- Their price is less than the active filters.
- The element used in the circuitry explains the filter order.
- These filters are less complicated than active filters.
- The use of inductors increases its weight.
- Their Q factor is less than the active filters.
- This circuit is not need any exterior power supply.
- These circuits are known as passive since there is no need for outer supply to work on
- The inductor used in the circuitry helps to stop the larger frequency elements and operates on less.
- The type of filter circuitry that allows the signal to move from the inductor is called low pass filter
- This circuitry has capacitors and inductors as reactive components.
- These are less sensitive than passive filters.
Active and passive Filter
Active Filter
- It uses different active components for working such as Op-amp and transistor
- It uses an external power supply for working.
- It has high power gain.
- it comes with high input impedance and low output impedance.
- it has constant featues for varying loads.
- it has active and passive component without inductor.
- it has limited frequency features since limited bandwidth for op-amp
- It does not face resonance problems
- high Q factor it has but is a high-cost device.
- It does not handle highly current
- complex designs and small-size devices.
Passive Filter
- It works with the use of passive components like resistors, capacitors, and inductors.
- It does not need an outer power supply and does not have power gain.
- Its input impedance is medium and comes with medium output.
- Its components structured is with passive components.
- There are no frequency restrictions and are affected by resonance
- low Q factor and low-cost device.
- simple design device
What is the difference between active and passive RF filters?
- Passive filters are simply designed and active filters have good functions, well signal isolation, and featues for handling complicated transfer operations.
What is the main difference between active and passive components?
- The active component uses an external power supply for working and passive components are not needed. Active components generate energy in voltage, or curent, and passive components store or maintain energy in voltage or current form.
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That is all about the difference between active filter and passive filter if you have any query ask in comments. Thanks for reading. Have a good day.