Switching Electronics [ELEC 3230 Notes] by R. Betz

By R. Betz

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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 [1]. 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 [1] experimental data is presented). 8. This circuit has been implemented in the Saber simulation package.

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