By R. Betz
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Additional info for Switching Electronics [ELEC 3230 Notes]
4 one has an exponential rise in the voltage across the capacitor. 10) Of course the waveforms are more complex when one has a rise time on the input waveforms. 9) can be used to ﬁnd the approximate capacitance associated with a circuit by considering the time constant of a rising signal. Of course one must know the resistance in the circuit in order to do this. 2 Capacitive circuits at high frequencies contain a mixture of eﬀects from inductance and capacitance. For example, the leads into a capacitor have some inductance.
Therefore the capacitance does not load circuit A. 2. The signal voltage coupled in circuit B is smaller that the signal on A. Therefore the small coupled voltage in B can be ignored and the voltage across the capacitor can be considered to be vA . Note that this is also making an assumption about the impedance to ground of circuit B. 3. The capacitor is a large impedance compared to the impedance to ground of circuit B. The noise voltage is calculated as the noise current im times this impedance.
26) to get the crosstalk . 2 This example comes from . 063in thick epoxy board). Note that the board has a ground plane on the noncomponent side. We are interested in the coupling between the two 1/4 watt resistors R2 and R3 . R1 is on the board to terminate the driving signal from the pulse generator. 7V signal with a rise time of 800ps. We can simulate this situation to get some idea of what would happen (in  experimental data is presented). 8. This circuit has been implemented in the Saber simulation package.