Page 175 - Analog and Digital Filter Design
P. 175
1 72 Analog and Digital Filter Design
Exercises
5.1 A normalized inductor value is 0.6834. Denormalize this for a passive
highpass filter having a load resistance of 100 ohms and a cutoff fre-
quency of 12 kHz. What is its denormalized value?
5.2 A normalized capacitor value is 0.7490. Denormalize this for a passive
highpass filter having a load resistance of 75 ohms and a cutoff fre-
quency of 10 kHz. What is its denormalized value?
5.3 A second-order filter has lowpass poles at -0.6205 k j0.8075. What are
the two resistor values for a normalized highpass Sallen and Key active
filter (let C1 = C2 = lF)?
5.4 For the active filter in Exercise 5.3, let the capacitor values equal 1 nF.
What are the resistors values (R1 and R2) if the cutoff frequency is
15 kHz?
