Timeline for Current source design
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 22, 2016 at 20:10 | answer | added | D.A.S. | timeline score: 0 | |
| Sep 22, 2016 at 18:57 | vote | accept | Archimedes | ||
| Sep 22, 2016 at 18:30 | answer | added | Spehro 'speff' Pefhany | timeline score: 1 | |
| Sep 22, 2016 at 16:04 | comment | added | Archimedes | hfe is 154, but I ran the parameter sweep and the output current doesn't change much with hfe changing | |
| Sep 22, 2016 at 16:01 | comment | added | WhatRoughBeast | What Tony Stewart said. The coursework must include transistor gain. What is it? | |
| Sep 22, 2016 at 15:28 | comment | added | D.A.S. | If D1 is identical to Vbe junction Rs values then they shared current equally, then Ic=hFE * I(R1)/2.. When matched this is called Current Mirror | |
| Sep 22, 2016 at 15:23 | comment | added | D.A.S. | This is not how to design a CC unless you assume Vbe and D1 are identical junctions and hFE is fixed. Thus you use fixed R ratios on emitter and collector so hFE is less an effect then 2 diodes or a transistor instead of D1 to sense Re voltage and regulate Vbe. so this is purely academic poor discrete design, but ok if matched parts inside an IC | |
| Sep 22, 2016 at 15:23 | answer | added | Neil_UK | timeline score: 2 | |
| Sep 22, 2016 at 15:17 | history | edited | Archimedes | CC BY-SA 3.0 |
added 8 characters in body
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| Sep 22, 2016 at 15:12 | history | asked | Archimedes | CC BY-SA 3.0 |