Lab 7 - Prelab - UNIVERSITY OF CALIFORNIA, BERKELEY EE40:...

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UNIVERSITY OF CALIFORNIA, BERKELEY EE40: Introduction to Microelectronic Circuits Diodes Background Overview – The Ideal Diode An ideal diode allows current to flow in only one direction. Every diode has a characteristic “threshold voltage” – V T . An ideal diode has an infinite resistance when the voltage across it, V D , is less than V T and zero resistance when the V D is greater than V T . The threshold voltage concept comes from the fact that a diode is just a pn junction; the threshold voltage is defined by the concentration of donors and acceptors in the junction. The I-V graph for an ideal diode should look like: Figure 1 Ideal Diode IV Curve and Schematic Real diodes do not exhibit this ideal behavior. This lab will explore the actual behavior of diodes. Diode Logic Diode logic (DL) is a family of logic circuits that perform logic operations based on the ability of the diode to conduct current in only one direction, under forward bias. Figure 2 contains the schematics for OR and AND gates implemented in
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This note was uploaded on 01/25/2011 for the course EE 100 taught by Professor Boser during the Spring '07 term at University of California, Berkeley.

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Lab 7 - Prelab - UNIVERSITY OF CALIFORNIA, BERKELEY EE40:...

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