Signals and Systems · Digital Filters · 1 mark · Multiple choice
The shown asymptotic Bode magnitude of a second-order low-pass filter has its corner at 1 kHz and DC gain 0 dB. At what frequency is attenuation 80 dB?
A second-order low-pass asymptote decreases by forty dB per decade beyond its corner. Eighty dB therefore requires two decades, a frequency factor of one hundred. Starting from one kHz gives one hundred kHz, C.
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