,filters ,types of filters ,properties of symmetrical networks ,filter design ,active filters

1. FILTERS

2. Muhammad Golam Kibria
ID: 20151102029
Dept. of Applied Physics, Electronics and
Communication Engineering

3. PROPERTIES OF SYMMETRICAL NETWORKS
T Network:
Series arms are equal
π Network:
Shunt arms are equal

4. PROPERTIES OF SYMMETRICAL NETWORKS
a) Ladder Network made from T-sections
b) Ladder Network made from ∏ section

5. PROPERTIES OF SYMMETRICAL NETWORKS
For symmetrical T section:

6. PROPERTIES OF SYMMETRICAL NETWORKS
For symmetrical π section network

7. Arafat Jamil
ID: 20151102035
Dept. of Applied Physics, Electronics and
Communication Engineering

8. FILTER FUNDAMENTALS
DEFINITION
Electronic filters are circuits which perform signal
processing functions, specifically to remove unwanted frequency
components from the signal, to enhance wanted ones, or both.
• Attenuate or amplify component of the signal
• Reject or isolate specific frequency components
• Frequency Selective circuit
• Transmission System

9. Bands
• a) Passband (PB)
• b) Stopband (SB) or rejection band
• c) Transition band

10. Characteristics
a) Cutoff and stopband frequencies:
passband ends and the stopband begins
b) Passband(s) ripple(s) and stopband(s) attenuation(s):
Maximum attenuation at passband, Minimum attenuation at stopband
c) Others:
magnitude, phase, group delay

11. Afsana Mim
ID: 20150102041
Dept. of Applied Physics, Electronics and
Communication Engineering

12. TYPES OF FILTERS
A.C filter networks - 2 major types:
1. Active Networks
2. Passive Networks

13. TYPES OF FILTERS
Passive Filters:
1. Low pass filter
2. High pass filter
3. Band pass filter
4. Band elimination filter

14. TYPES OF FILTERS
• High pass filter ▪ Low pass filter

15. TYPES OF FILTERS
Band Pass Filter Band Elimination Filter

16. Tanvir Sikder
ID: 20151102045
Dept. of Applied Physics, Electronics and
Communication Engineering

17. ACTIVE FILTERS
An active filter is a type of analog
electronic filter that uses active
components such as an amplifier.

18. ACTIVE FILTERS
The most common types of active filters are
classified into four such as
•Butterworth
•Chebyshev
•Bessel
•Elliptical

19. ACTIVE FILTERS
Advantages:
1. Less Cost
2. Gain and Frequency Adjustment Flexibility
3. No Loading Problem
4. Size and Weight
5. Non-floating Input and Output

20. ANY QUESTION?