4-38
Table 4-1.—Resistive and reactive values
HARMONIC
XC
R
FUNDAMENTAL
159 K
W
25 K
W
3rd
53 K
W
25 K
W
5th
31.8 K
W
25 K
W
7th
22.7 K
W
25 K
W
9th
17.7 K
W
25 K
W
11th
14.5K
W
25 K
W
The harmonics not effectively developed across the capacitor must be developed across the resistor
to satisfy Kirchhoff's voltage law. Note the pattern of the voltage waveforms across the resistor and
capacitor. If the waveforms across both the resistor and the capacitor were added graphically, the resultant
would be an exact duplication of the input square wave.
When the capacitance is increased sufficiently, full integration of the input signal takes place in the
output across the capacitor. An example of complete integration is shown in figure 4-32 (waveform eC).
This effect can be caused by significantly decreasing the value of capacitive reactance. The same effect
would take place by increasing the value of the resistance. Integration takes place in an RC circuit when
the output is taken across the capacitor.
Figure 4-32.—Integration.
