Lecture4a

# Lecture4a - Diode ON V out = Diode OFF V out = The output...

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Lecture 4. SIMPLE DIODE CIRCUITS Objectives: Obtain transfer characteristics of electronic circuits Describe the operation principle of clippers/limiters Find circuit output from its transfer characteristic Topics: The transfer characteristics Clipper/limiter circuits Examples

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Diode Circuits - perform various functions (clipping, limiting, rectification) using nonlinear properties of diodes Each circuit is a system with 2 sets of terminals: Input Output Signal = How do we get relationship between the input and the output signals output=f(input) ? Why do we need to know output=f(input) ?
The Transfer Characteristic - shows relationship between the input and the output graphically Usually 1 input value 1 output value Sometimes 1 input value several output values (called hysteresis) The transfer characteristic is usually obtained by analyzing a circuit Consider a voltage divider

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The Transfer Characteristic (Circuit with a Diode)

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Unformatted text preview: Diode ON: V out = Diode OFF: V out = The output is clipped at To get a more accurate transfer characteristic, use a piecewise linear model for the diode Where is the rest of V in ? Clipper/Limiter- the diode circuit on the previous slide clips only the positive voltage More traditional configuration: a) D 1-ON, D 2-OFF b) D 1-OFF, D 2-ON c) D 1-OFF, D 2-OFF Clipper/Limiter (continued)- clips the input voltage at ± V f How to use the transfer characteristic? EXAMPLE (previous circuit) Input – 10V peak-to-peak triangle wave Sketch the output signal Input is clipped on both positive and negative sides The circuit could be modified to have an asymmetrical transfer characteristic Modified Limiters- introduce an extra voltage source to shift the positive limiting voltage- alternatively, use a Zener diode EXAMPLE- design a ± 3V limiter for a frequency counter...
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## This note was uploaded on 06/30/2010 for the course EECE 315 taught by Professor Nikulin during the Fall '08 term at Binghamton.

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Lecture4a - Diode ON V out = Diode OFF V out = The output...

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