PPT Slide

Example 5-5

5.7.2 Filters cont.

Design the band-pass filter to have a center frequency of 1 MHz. and a bandwidth of 10 kHz. What’s this filter’s Q?

w0 = 2pf0 = 2p´106 Rad./Sec. = 1/(LC)½ = (Center frequency)

B = 2pfBW = 2p´104 Rad./Sec. = (RS +RL)/L = 150W/L (Bandwidth)

\ L = 150W / (2p´104 Rad./Sec.) » 2.39 mH

and C = 1 / (w02L) » 1/[(2p´106 Rad./Sec.)2´2.39 mH] » 10.6 pF

and Q = w0 / B = (2p´106 Rad./Sec.) / (2p´104 Rad./Sec.) = 100