Understanding low, high and band pass filters
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1. A signal in the IF section of an FM radio receiver occupies the frequency band 10.61 MHz to 10.79 MHz. Compute the bandwidth of this signal.
2. A signal in the IF section of an FM radio receiver occupies the frequency band 10.61 MHz to 10.79 MHz. There is another FM signal occupying the frequency range 11.01 MHz to 11.19 MHz. A filter is used to extract the first signal. What type of filter is needed?
3. At frequencies well above the 3 dB frequency of a fourth order Butterworth low pass filter, compute the rate at which the attenuation of the filter increases.
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1. The frequency band in use is 10.61 MHz to 10.79 MHz
or, 10610 kHz to 10790 kHz (as 1 MHz = 1000 kHz).
Now the bandwidth is 10790 - 10610 = 180 kHz.
As 180 kHz = 180,000 Hz there ...
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