First_order filters.doc

# First_order filters.doc

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First –Order Filter Objective: The main purpose of this experiment is to introduce the first- order filter analysis and its design. Procedure: 1. Low pass filter: After building the low-pass filter circuit on the protoboard, we created a data table with four columns labeled by the frequency, input voltage, output voltage, and the gain. The function generator was set to produce a 10 Hz and 2Vpp sine wave. By maintaining the same input voltage, we started varying the signal frequency logarithmically. And for each value of frequency, we recorded the input, and output voltages and we computed the gain. We noticed that the gain kept approximately constant (=G) then it began to decrease. At 0.707*G we found the corresponded value of frequency; this is "the cut- off frequency". 2. High pass filter design: After building the high pass filter designed in the prelab, we re-measured as for the low pass filter, and at different frequencies, the values of input and output voltages and the gain beginning at 10 Hz and reaching 1 MHz.

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• Winter '19
• Low-pass filter, 4.7k, 0.16%, 1.414g, 0.707G, 1.187 %

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