Question

Filtering for an electronic oscillator From Figure 4.5, we see that a sinusoid of frequency ω0 is present in a square wave. Hence, in the oscillator, we must remove (filter out) the frequencies at 3ω0, 5ω0, and so on, to produce a sinusoid of frequency of wo The electronic oscillator can be depicted by the system of Figure 4.7. The input signal to the filter is a square wave, and its output signal is a sinusoid of the same frequency. The en- gineers designing the oscillator of Figure 4.7 have the two design tasks of (1) designing the square-wave generator and (2) designing the filter. We introduce filter design in Chapter 6. The system of Figure 4.7 is used in many oscillators, because the square wave is easy to gen erate and the higher frequencies are not difficult to filter out. A filter of the type required is analvzed mathematically in Section 4.5. Square-wave| AA. Filter generator Figure 4.7 Electronic oscillator. Determine whether the following function can be presented x(t) -cos (3t) + sin(5t) Soot 2 2 4

Answer 1

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