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Second Order VCVS Sallen Key Low Pass Filter Lab
Objective & Procedure:
Implement a second order, voltage-controlled voltage-source (VCVS) Sallen Key
Filter with the following conditions.
a) For a Butterworth Response
b) For a Chebyshev Response with a 3dB ripple width
Figure 2: 2nd Order Chebyshev VCVS Sallen Key Filter
In both configurations utilize the following parameters:
Conclusions & Discoveries:
It was verified that the expected response in each of the Butterworth and Chebyshev low pass filters
rolled of accordingly. The Butterworth filter although smooth in the pass band region, rolled off
slower then the Chebyshev. However, to obtain the faster roll off in the Chebyshev low pass filter,
a 3dB ripple in the pass band was present. Therefore, depending on the requirements of your filter
there is a tradeoff of fast roll off vs. pass band ripple.
In closing, the overall analysis of deriving the transfer function and implementing the circuit using
simulations and experimental measurements in a laboratory environment allowed one to develop an understanding
of the different response and applications for these types of low pass filter configurations.
Electrical Engineering lab key words: Voltage controlled voltage source, VCVS, Sallen key,
low pass filter, filters, bandwidth, linear systems, filter analysis, Matlab, Pspice,
simulation, filter parameters, Butterworth response, Chebyshev response, passband.
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