Week #3: (2/6-2/10) Differentiators, Integrators & other interfacing devices.

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Week #3: (2/6-2/10) Differentiators, Integrators & other interfacing devices.

Post by rjagodowski »

NOTE: This week (2/6) we will be meeting for class on Monday instead of Wednesday.

This week, in preparation for this week's lab exercise posted here, we will quickly review the Op-Amp Differentiator and Integrator Circuits presented last wee. Here are some links from Wisc-Online to explain their operation.

Op-Amp Differentiator

Op-Amp Integrator. This one has sound.

One thing to keep in mind. Each of the presentations above talks about Capacitive Reactance as being 1/(2*Pi*f*C) . Of course you remember that Capacitive Reactance is only applicable to sinusoidal signals (pure sines & cosines). So, how can that concept be used for the non-sinusoidal signals used in these presentation and in the lab? Because if you look at the harmonic content of each signal, Fourier Analysis states that these signals can be represented as a series of perfect sine waves of specific frequency, amplitude and phase. The lowest (non-D.C.) component of these signals is called the Fundamental Frequency and the subsequent multiple frequencies are known as Even Harmonics and/or Odd Harmonics depending upon their multiple of the Fundamental Frequency. The key issue to keep in mind is that the faster a signal changes, the higher the frequency of the related harmonics. So if you look at the harmonic content components individually, you can apply the capacitive reactance formula to each frequency component.

It is highly recommended that you understand the operation of the both the Differentiator and the Integrator circuits before performing this week's lab experiment.

We will then complete the rest of Chapter 2 in the text which includes such topics as Opto-Electronic Devices, Digital Magnitude Comparators, ADCs and DACs, and 555 Timer Circuits. We will then begin Chapter 3 on Controller Operation. Handouts for the presentation of this chapter can be found in the Registered Users Only section here.
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