Timeline for Why Collector-to-Base currents ratio in a BJT transistor is always greater than 1?
Current License: CC BY-SA 3.0
13 events
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| Mar 17, 2016 at 15:25 | history | edited | LvW | CC BY-SA 3.0 |
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| Mar 17, 2016 at 14:50 | history | edited | LvW | CC BY-SA 3.0 |
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| Mar 17, 2016 at 12:29 | comment | added | nalzok | @LvW I know it's not proper to ask you to answer my questions under other's answer, because you won't get any reputation from this. So would you please write an answer just by copying & pasting your comments? I'll upvote and accept it. | |
| Mar 17, 2016 at 12:26 | comment | added | nalzok | @LvW Also, "Given VBE, IE is fixed, and as a result, the sum of IB and IC is fixed. When VCE < VBE, what IB and IC are depend on VCE. The greater VCE is, the greater IC/IB is. However, the value of IC/IB is capped by "beta", which is reached when VCE = VBE. " Is this right? | |
| Mar 17, 2016 at 12:01 | comment | added | nalzok | IC and IE are controlled and only controlled by VBE; IB is just a side product; Once VCE is greater than VBE, its specific value does not matter, because E-B junction is reverse-biased. Am I right? | |
| Mar 17, 2016 at 11:53 | comment | added | nalzok | @LvW Just out of curiosity: What if VCE = VBE? C-B pn junction won't be reverse-biased then, so it won't attract electrons in base region. Thus, IC will be zero, and IE will be equal to IB? | |
| Mar 17, 2016 at 11:23 | comment | added | LvW | Yes - collector current IC only depends on VBE. There is a current IB, of course, but it has no controlling function (can 3 holes from the base cause 1000 electrons to leave the emitter?). | |
| Mar 17, 2016 at 11:21 | comment | added | LvW | Collector-emitter voltage VCE (a) reversely biases thge C-B pn junction (necessary for amplification) and (b) causes the charged carriers emitted by the emitter to move through the base region (99.5%) because they are attracted by the VCE>VBE.. | |
| Mar 17, 2016 at 10:22 | comment | added | nalzok | Also, can I say "Collector current only depends on base-emitter VOLTAGE"? (Sorry for asking so many questions!) | |
| Mar 17, 2016 at 10:20 | comment | added | nalzok | And what essentially causes the emitter current? Perhaps base-emitter voltage? | |
| Mar 17, 2016 at 10:18 | comment | added | nalzok | Then can you tell me what does the corrector-emitter voltage control? | |
| Mar 17, 2016 at 10:11 | history | edited | LvW | CC BY-SA 3.0 |
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| Mar 17, 2016 at 9:36 | history | answered | Whit3rd | CC BY-SA 3.0 |