Lab 7. Active Band Pass Filters

Laboratory Work

This lab will focus on the basic thing in active circuit designs, including how to create

schematics in ADS. Building Active Band Pass Filters in ADS:

Step 1: Build the following circuit with the same components values and pay special attention

to the marked components values:

Step 2: Select Simulation-AC and drag “AC” to the design environment. Input the related

parameters as below.

Step 3: You can either set the voltage gain equation in the schematic (in Lab 5) or the data

display (Lab 6). Please plot the voltage gain curve and attached the screen shot below. (30

marks)

Please answer the questions below:

What is the variation trend of Gain with frequency? try to explain why. (20 marks)

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Step 4. Based on the same filter structure apply 50 Ohm terminals to the input and output

port, and run both AC and S-parameter simulations within the same frequency range.

Attach the screenshots of S21 and voltage gain below (30 marks)

Please answer the questions below:

What are the values of S21 and voltage gain in the filter’s passband? And why are they different?

?20 marks?

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