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Active 1st Order Filters Objective An active filter is a type of analog electronic filter distinguished by the use of one or
the first order low pass filter phase). (or use Matlab Op-Amp) 6. Draw the bode plot for the transfer function (mag and 7. Fi
Active 1st Order Filters Objective An active filter is a type of analog electronic filter distinguished by the use of one or more active components. Typically this will be a yacuum tube, or solid-state Active filters have three main advantages over passive filters: Inductors can be avoided. Passive filters without inductors cannot obtain a high Q (low damping), but with them are often large and expensive (at low frequencies), may have significant internal resistance, and may pick up surrounding electromagnetic signals. The shape of the response, the Q Quality factor), and the tuned frequency can often be set easily by varying resistors, in some filters one parameter can be adjusted without affecting the others. Variable inductances for low frequency filters are not practical. The amplifier powering the filter can be used to buffer the filter from the electronic components it drives or is fed from, variations in which could otherwise significantly affect the shape of the frequency response Figure 1: Active First Order Low Pass Filter Pre-lab 1, Design a first order low pass filter with fc = 2k Hz, DC gain of-5 Pick a capacitor values that can be found in the lab. the first order low pass filter phase). (or use Matlab) 2. Determine the transfer function (with your values) for 3. Draw the bode plot for the transfer function (mag and 4. Design a first order high pass filter with fc 2k Hz, De gain of-5 5. Determine the transfer function (with your values) for
the first order low pass filter phase). (or use Matlab Op-Amp) 6. Draw the bode plot for the transfer function (mag and 7. Find the pin out (from the data sheet for the LM741 Figure 2: RC High Pass Filter
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