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| university:courses:electronics:electronics-lab-27 [08 Jul 2022 15:35] – [Materials:] Doug Mercer | university:courses:electronics:electronics-lab-27 [08 Jul 2022 15:36] (current) – [Background:] Doug Mercer |
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| <WRAP centeralign> Figure 4 Output Stage </WRAP> | <WRAP centeralign> Figure 4 Output Stage </WRAP> |
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| The diode, D<sub>1</sub>, serves to increase the effective turn on voltage of Q<sub>4</sub> which allows it to be turned off before Q<sub>3</sub>turns fully on. This helps prevent potentially large surge currents from flowing in the output stage during transitions between logic states. Resistor R<sub>4</sub> also serves to limit the current that is allowed to flow in the output stage. The disadvantage is that the logic high voltage is reduced by an amount of the diode drop as shown in figure 6. | The diode, D<sub>1</sub>, serves to increase the effective turn on voltage of Q<sub>4</sub> which allows it to be turned off before Q<sub>3</sub>turns fully on. This helps prevent potentially large surge currents from flowing in the output stage during transitions between logic states. Resistor R<sub>4</sub> also serves to limit the current that is allowed to flow in the output stage. The disadvantage is that the logic high voltage is reduced by an amount of the diode drop as shown in figure 7. |
| ===== Materials: ===== | ===== Materials: ===== |
| ADALM2000 Active Learning Module\\ | ADALM2000 Active Learning Module\\ |
