Page 225 - Analog and Digital Filter Design
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222 Analog and Digital Filter Design
7.2 Using the equations for designing a passive bandstop filter from a
lowpass prototype in a single step, design a Butterworth third-order
passive bandstop filter. The center frequency is 1 MHz and the stop-
band width is 100kHz. Start with the shunt capacitor of a lowpass
prototype. The source and load impedance is 50Q.
7.3 A Cauer active bandstop filter uses a biquad section. The center fre-
quency of the bandstop filter is 50 kHz, but the Cauer design produces
a zero at 49 kHz (i.e., nodes B and C are connected). Given that R = R'
= 10 kQ and C = 470pF, what are the values of R1, R2, R3, R4, R5,
and R6?
