Timeline for BJT transistor sum
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Oct 18, 2023 at 3:49 | vote | accept | Star Lord | ||
| Oct 9, 2023 at 4:26 | history | edited | periblepsis | CC BY-SA 4.0 |
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| Oct 8, 2023 at 19:53 | history | edited | periblepsis | CC BY-SA 4.0 |
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| Oct 8, 2023 at 19:11 | comment | added | periblepsis | @Circuitfantasist If I am reading you correctly (that you don't understand why it is that this kind of problem is given to students) then I guess my answer is that (1) there are many ways to pose questions that test a student's ability to think though problems and this is one such; and, (2) although unlikely it is possible that a student might later in life actually encounter such a design; and, (3) analyzing this structure (not for DC Q-point but for its sensitivities to variations in device and supply rail) can help explain why it is rarely seen. | |
| Oct 8, 2023 at 9:23 | comment | added | Circuit fantasist | Aside from these calculations, I would make a revelation: I have never understood the meaning of this circuit solution often put in the questions here. Why? It is a transistor stage with a true voltage input with high resistance (thanks to the emitter resistor R3); therefore it should be controlled with a voltage divider. If there were no emitter resistor, then it would be a transistor stage with current input having a low input resistance; then it could be driven through a base resistor. Here it has a voltage input but we control it through a resistor R1 like a stage with a current input. | |
| Oct 8, 2023 at 3:29 | history | edited | periblepsis | CC BY-SA 4.0 |
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| Oct 8, 2023 at 3:22 | history | answered | periblepsis | CC BY-SA 4.0 |