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Impedance - Notes on input and output impedance The topics...

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Notes on input and output impedance The topics of input and output impedance are important in instrumentation, especially when one device, system or instrument in connect to another. "Impedance matching" can be very important, thus finding input and output impedances is a critical part of instrumentation analysis and design. Unfortunately, the definitions and methods of determination are not so clear. Many texts do not give precise methods for these calculations. Some of these have been discussed in BE186B, but certain cases may not be clear, so here is a summary that may be helpful. Output impedance : This is typically more straight-forward. The approach for finding the output impedance of an instrument (in this case an electronic circuit), would be to find the Thevenin equivalent of the circuit between the output terminals, and take the Thevenin resistance (impedance) in that equivalent as the output resistance (impedance). One type of circuit in which this is not always clear would be a circuit with some "unknown" input source as shown in (a) below: Here, if we are interested in the output impedance, it is not clear if we should include the actual voltage source or not. The value of the equivalent impedance between the V
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