Tag: Spectrum Analysis

7.5 Circuit Effects
The principle of nonsinusoidal, repeating waveforms being equivalent to a series of sine waves at different frequencies is a fundamental property of waves in general and it has great practical import in the study of AC circuits. It means that any time we have a waveform that isn’t perfectly sinewaveshaped, the circuit in question will…

7.4 More on Spectrum Analysis
Computerized Fourier analysis, particularly in the form of the FFT algorithm, is a powerful tool for furthering our understanding of waveforms and their related spectral components. This same mathematical routine programmed into the SPICE simulator as the .fourier option is also programmed into a variety of electronic test instruments to perform realtime Fourier analysis on…

7.3 Other Waveshapes
As strange as it may seem, any repeating, nonsinusoidal waveform is actually equivalent to a series of sinusoidal waveforms of different amplitudes and frequencies added together. Square waves are a very common and wellunderstood case, but not the only one. Electronic power control devices such as transistors and siliconcontrolled rectifiers (SCRs) often produce voltage and…

7.2 Square Wave Signals
It has been found that any repeating, nonsinusoidal waveform can be equated to a combination of DC voltage, sine waves, and/or cosine waves (sine waves with a 90 degree phase shift) at various amplitudes and frequencies. This is true no matter how strange or convoluted the waveform in question may be. So long as it…

7.1 Introduction to MixedFrequency AC Signals
In our study of AC circuits thus far, we’ve explored circuits powered by a singlefrequency sine voltage waveform. In many applications of electronics, though, singlefrequency 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 sinewave…