In the next slide, we will see more detail on this.Ī plot of gain versus frequency for a zero is shown in the lower right. Bode plotter multisim plus#Ī zero causes the gain to increase at a rate of plus 20 dB per decade in frequency. This also makes sense, because for higher frequencies, the numerator will become large, causing the magnitude to increase. This slide illustrates the equations for a pole and its associated response. Later, we will provide a real-world circuit example for a pole. Looking at the equations, you can see that the first equation represents a pole as a complex number.Ĭomplex numbers have a real and imaginary part. For practical circuits, the complex function is converted to a magnitude and phase. The second equation shows the magnitude, and the third equation shows the phase. Taking 20 times the log base 10 of the magnitude gives the magnitude in dB. The graphs show the magnitude in dB as well as the phase in degrees. Notice that both the horizontal axis and vertical axis are logarithmic. Let's look at some key points on the Bode plot. First, the pole frequency is denoted by fp. For frequencies below fp, the gain is constant and is denoted by Gdc. In other words, the gain at DC, or zero frequency, would be Gdc.
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