Basic DC TheoryDC SOURCESWhen a hole combines with an electron, or an electron combines with a hole near the p-njunction, an electron from an electron-pair bond in the p-type material breaks its bond and entersthe positive side of the source. Simultaneously, an electron from the negative side of the sourceenters the n-type material (Figure 4C). This produces a flow of electrons in the circuit.ReverseBiasReverse biasing occurs when the diode’s anode is connected to the negative side of the source,and the cathode is connected to the positive side of the source (Figure 5A). Holes within thep-type material are attracted toward the negative terminal, and the electrons in the n-type materialare attracted to the positive terminal (Figure 5B). This prevents the combination of electrons andholes near the p-n junction, and therefore causes a high resistance to current flow. Thisresistance prevents current flow through the circuit.Figure 5 Reverse-Biased DiodeRev. 0 Page 7 ES-02
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business