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Laboratory Report On Narrow Band pass Filter using Op-Amp (AIC LAB) Experiment no-09(open ended exp-01)

Submitted by Dibyendu Pradhan(1904023) Satyam Vats(1904045) Sujeet kumar(1904055)

B. Tech Programme in Electronics and Telecommunication Engineering

School of Electronics Engineering Kalinga Institute of Industrial Technology, Deemed to be University Bhubaneswar, India

April 2021

OBJECTIVE Design and simulation of narrow band pass filter circuit using op-amp in TINA-TI simulation software.

THEORY A band-pass filter is a circuit which is designed to pass signals only in a certain band of frequencies while attenuating all signals outside this band. These filters are available in different types; some of the band pass filter design can be done with an external power as well as active components such as integrated circuits, transistors, which are named as an active band pass filter. There are basically two types of bandpass filters viz wide bandpass and narrow bandpass filters. A BPF is defined as a wide bandpass if its quality factor Q is less than 10 (Q < 10) while the bandpass filters with Q > 10 are called the narrow bandpass filters. A narrow bandpass filter employs only one Op-Amp as shown in the figure. This filter has some unique features given below: 

It has two feedback paths, and this is the reason that it is called a multiple-feedback filter.



The Op-Amp is used in the inverting mode.

Circuit diagram

REQUIREMENTS Name of Apparatus

Quantity

Resistors Capacitors Op-Amp (uA741) Voltage supply Function generator Voltage pin

5 (10k, 4.77k, 6.2k, 5.97, 100k) 2 (10n, 10n) 1 2 (15V each) 1 (Sine wave) 1

A personal computer/laptop with TINA-TI software installed.

CIRCUIT DIAGRAM

DESIGN CALCULATIONS Generally, the narrow bandpass filter is designed for specific values of centre frequency fc and Q or fc and BW. The circuit components are determined from the following relationships. For simplification of design calculations, each of C1 and C2 may be taken equal to C. R1 = Q / (2π fc C Af) R2 = Q / 2π fc C(2Q2 – Af)

R 3 = Q / π fc C Where Af is the gain at centre frequency and is given as Af = R3 / 2R1 The gain however must satisfy the condition Af < 2 Q2. The centre frequency fc of the multiple feedback filter can be changed to a new frequency f’c without changing the gain or bandwidth. This is achieved simply by changing R2 to R’2 so that R’2 = R2 [fc / f’c]2

OBSERVATIONS

CONCLUSION Designed and simulated the narrow band pass filter circuit using Op-Amp in TINA-TI software and analysed the characteristics. Hence, from the observations we understood the relationship between different parameters and calculated the results respectively.

REFERENCES [1] https://www.circuitstoday.com/band-pass-filters [2] Ramakant A. Gayakwad, “Op-Amps and Linear Integrated Circuits”, 4th edition, Pearson India Education Services Pvt. Ltd., ch. 7, pp. 274-276

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