|
In our study of AC circuits thus far, we've
explored circuits powered by a single-frequency sine voltage
waveform. In many applications of electronics, though,
single-frequency signals are the exception rather than the
rule. Quite often we may encounter circuits where multiple
frequencies of voltage coexist simultaneously. Also, circuit
waveforms may be something other than sine-wave shaped, in
which case we call them non-sinusoidal waveforms.
Additionally, we may encounter situations
where DC is mixed with AC: where a waveform is superimposed
on a steady (DC) signal. The result of such a mix is a
signal varying in intensity, but never changing polarity, or
changing polarity asymmetrically (spending more time
positive than negative, for example). Since DC does not
alternate as AC does, its "frequency" is said to be zero,
and any signal containing DC along with a signal of varying
intensity (AC) may be rightly called a mixed-frequency
signal as well. In any of these cases where there is a mix
of frequencies in the same circuit, analysis is more complex
than what we've seen up to this point.
>>Know More
|
