EE - 409 / E01 Fall 2003

Network Analysis and Synthesis

Professor: Ho

Submitted By:

Andrew Buettner

Lab #1: 10th Order Passive Band Pass Filter

Monday, October 13, 2003

1) Cover Page 1

3) Objective 3

4) Components Used 3

5) Procedures 3

6) Lab Data / Results 3

1) Diagram 1 3

2) Diagram 2 4

3) Table 1 4

4) Table 2 4

7) Conclusions 4

8) Attachments 4

Objective

The objective of this lab is to design a 10th order band pass filter using a 5th order low pass filter as a base. The filter will be designed using a normalized Chebyshev template then a table will be used to convert the system form a low pass filter to a band pass filter.

Components Used

1) PC With CircuitMaker® installed.

Procedures

1) Using a Chebyshev filter as a prototype, design a 10th order band pass filter with a center frequency of 10KHz and a bandwidth of 2KHz and Zo of 1KW.

Lab Data / Results

1) Diagram 1: Filter Frequency Response

2) Diagram 2: Filter Schematic

3) Table 1: L, C, R Values

1

2

3

4

5

L:

67.9mH

2.23mH

144mH

1.94mH

122mH

C:

3.73nF

114nF

1.75nF

131nF

2.07nF

R:

1KW

1KW

-

-

-

4) Table 2: Filter Response Data:

Ripple

Bandwidth

.576dB

2.01KHz

Conclusions

This lab has demonstrated that a 10th order band pass filter can be designed from a 5th order design. Here we used the Chebyshev filter as a template, however, any filter bas can be used if the proper transforms and scaling factors are applied. The primary difficulty with this lab was realizing that the scaling factors were in radians/second. Therefore, I had to apply an additional 2p scaling factor. After several attempts, I got the circuit functioning properly. The inconsistencies in the bandwidth are most likely a result from inaccuracy of the markers. The inconsistency in the ripple, which should be <.5dB is because the simulation reported a gain at certain frequencies which is not directly possible. Using 1 instead of the reported maximum yields a .490dB ripple in the passband. Overall, I believe that this lab was successful.

Attachments

1. Original lab handout

2. Original lab data

3. Calculations