Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

Active filter vs Passive filter-difference between active filter and passive filter

This page compares Active filter vs Passive filter and mentions difference between Active filter and Passive filter types. Advantages and disadvantages of both active filter and passive filter are also compared.

Filter definition:
The filter is a circuit which changes amplitude and phase of the input signal and produces output accordingly. It filters or eliminates some frequencies and passes some frequencies. Hence it provides different attenuations to different frequencies. Based on components used in the construction of the filter there are two types of filters viz. active filter and passive filter.

Active filter

First Order All-Pass Filter

Active Filter:
This filter type uses active components such as OP-AMP (i.e. operational amplifier) in addition to Resistors (R) and Capacitors (C) in the construction of the filter. Hence it is known as active filter. First order all pass active filter is depicted in the figure-1.

Advantages:
• No resonance issue
• It can eliminate any harmonics
• Used for voltage regulation
• Used for reactive power compensation
• It provides reliable operation

Disadvantages:
• It is expensive
• It provides complex control systems.

Passive Filter

rf filter design fig2

Passive Filter:
This filter type uses passive components such as resistors (R), coils or inductors (L) and capacitors (C) in the construction of filter. Hence it is known as passive filter. Normalized passive filter of order five and Lowpass type is depicted in the figure-2.

Advantages:
• Cheap
• Reliable
• Easy design
• High efficiency

Disadvantages:
• Resonance problems
• Tuning for fixed frequency
• Fixed reactive power compensation
• Large size



RF Filter Related Links

RF Filter calculator
Microstrip based RF Filter design
RF filter manufacturers
RF filter applications
RF filter selection guide
RF filter terminologies

RF RELATED LINKS

stripline basics and types
Microstrip line variants
Slotline basics and types
Finline basics
CPW(Coplanar Waveguide) basics
Types and basics of coaxial line
Types and basics of transmission line
RF Terms-Useful for RF design and testing.
RF-This page describes what is RF

what is difference between

difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
OFDM vs OFDMA
CDMA vs GSM
Bluetooth vs zigbee
Fixed wimax vs mobile

RF and Wireless Terminologies


Share this page

Translate this page