Suppose that we need a filter with the Bode plot shown in
Chapter 6, Problem P6.93(choose chapter or problem)
Suppose that we need a filter with the Bode plot shown in Figure P6.93(a). We decide to cascade a highpass circuit and a lowpass circuit as shown in Figure P6.93(b). We choose R2 = 100R1 so that the second (i.e., righthand) circuit looks like an approximate open circuit across the output of the first (i.e., left-hand) circuit. a. Which of the components form the lowpass filter? Which form the highpass filter? b. Compute the capacitances needed to achieve the desired break frequencies, making the approximation that the left-hand circuit has an open-circuit load. c. Write expressions that can be used to compute the exact transfer function H(f) = Vout/Vin and use MATLAB to produce a Bode magnitude plot for f ranging from 1 Hz to 1MHz.The result should be a close approximation to the desired plot shown in Figure P6.93(a).
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