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Passive Band Pass Filters - Laboratory Experiment 11 | ELEC 195, Lab Reports of Microelectronic Circuits

Wentworth Institute of Technology (WIT)Microelectronic Circuits
Prof. Ali Khabari

Material Type: Lab; Professor: Khabari; Class: CIRCUIT THEORY II; Subject: Electronics; University: Wentworth Institute of Technology; Term: Unknown 1989;

Typology: Lab Reports

Pre 2010

Uploaded on 08/18/2009

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Wentworth Institute of Technology Name:
Department of Electronics and Mechanical Date:
ELEC 195 - Circuits Theory II
Experiment 11
Passive Band-Pass Filters
Objective:
1. To become familiar with the characteristics of passive band-pass filters.
2. To analyze the frequency response of band-pass filters.
3. To find the cutoff frequencies and bandwidth experimentally and comparing them
with theoretical value.
Equipment Required:
Resistors: 1K Jumpers
Capacitors: 0.1F
Inductors: 10mH A breadboard
Leads BNC connectors
Resume of Theory:
Passive band-pass filters or tuned filters use all three components (resistors, capacitors
and inductors) to achieve their goals. The frequency response of the tuned filter is shown in the
Figure below. The band frequencies between the high and low cutoff frequencies is called the
bandwidth (BW).
A. Khabari Wentworth Inst. of Tech. Page 1
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Wentworth Institute of Technology Name: Department of Electronics and Mechanical Date: ELEC 195 - Circuits Theory II

Experiment 11

Passive Band-Pass Filters

Objective:

  1. To become familiar with the characteristics of passive band-pass filters.
  2. To analyze the frequency response of band-pass filters.
  3. To find the cutoff frequencies and bandwidth experimentally and comparing them with theoretical value. Equipment Required: Resistors: 1K  Jumpers Capacitors: 0.1F Inductors: 10mH A breadboard Leads BNC connectors Resume of Theory: Passive band-pass filters or tuned filters use all three components (resistors, capacitors and inductors) to achieve their goals. The frequency response of the tuned filter is shown in the Figure below. The band frequencies between the high and low cutoff frequencies is called the bandwidth (BW).

These filters rely heavily on the operational concept known as resonance. A circuit is said to be at resonance when the total stored energy in the magnetic field of inductor is transferred to the capacitor then discharge, which stores it in the form of an electric filed. The capacitor then discharges so that the energy is again stored in the form of magnetic filed in the inductor. At the resonant frequency, the reactances are equal (XL = XC) and the circuit is purely resistive. Two different tuned filters (series and parallel) are shown in the Figure shown below. Procedure: Part 1: a) Construct the network shown below, and find the measured values of all three components (R,L,C). R (^) measured = _________

g) Plot Av versus frequency using MS-Excel computer program or a

computer program of your choice, and record the bandwidth. How does it compare to calculated value. BW = ____________

 - 0. Frequency (KHz) Vo(p-p) Av = Vo(p-p) / Vi(p-p) - 0. - 0. - 0. - 0. - 1. - 1. - 1. - 1. - 2. - 3. - 4. - 4. - 5. - 5. - 6. - 7. - 8. - 10. - 12. - 14. - 16. - 18. - 20. - 40. - 60.
  • h) Record the upper and lower cutoff frequencies as defined at the 0.

f1 (lower cutoff) = __________ f2 (upper cutoff) = __________ Part 2: Using Pspice or Electronic Work Bench computer program, simulate the frequency response of the band-pass filter and compare them with experimental data.