Question 11: The nominal impedance of a low pass 1 section filter is 500 ohms, and its cut-off frequency is at 100 kHz. Determine the value of the characteristic impedance of the section at a frequency of 90 kHz, and the value of the characteristic impedance of the equivalent low-pass T section filter.

The buck regulator in the next figure has an input voltage Vs = 15 V. The required average output voltage Va = 6.5 V at la = 0.5 A and the peak-to-peak output ripple voltage is 10 mV. The switching frequency is 20 kHz. The peak-to-peak ripple current of inductor is limited to 0.25 A. Determine (a) the duty cycle k, (b) the filter inductance L, O the filter capacitor C, and (d) the critical values of L and C. Q1 +eL iL + + ile io,la 10 Control Dm C Vc vo. V Load

a simple Circuit with R =50 ohm and L = 200mH would be a) high or low pass filter? and b) with f0 = ?

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