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Figure 10
Plot 1
Plot 2
Plot 3
Table 2
Chapter 2: Probing Considerations
Resistive Loading Effects
Figure 10 represents plots from three spice simulations showing this loading
effect. Plot 1 shows the signal edge before probing. Plot 2 shows the edge
after probing with a 6-pF probe and plot 3 after probing with a 15-pF probe.
Spice Simulation Of Probe Capacitance Loading Effects
Table 2 summarizes the data. It shows that the 6-pF probe didn't significantly
increase the rise time of the signal, but delayed it (referenced at the 50%
point) approximately 150 ps. The 15-pF probe not only slowed the rise time
approximately 33% but also delayed the edge 340 ps.
Probe Capacitance Loading Effect
Plot
Risetime
1
1 ns
2
1.067 ns
3
1.33 ns
26
Delay
0.0 ps
150 ps
340 ps
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