Timeline for Why is the gain of this dual stage amplifier less than 1?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Apr 26, 2023 at 18:00 | comment | added | Spehro 'speff' Pefhany | If you want Re3 to be 50 and you're happy with the base bias voltage then you have to decrease Rc2 so more of the voltage is dropped across the transistor. | |
| Apr 26, 2023 at 17:56 | comment | added | ChiefnBigNuts | Increasing the values for the base bias resistors for Q2 resulted in an improved waveform, however, the output is distorted. Ideally I'd like to keep Re3 set to 50, as I am aiming for a 50 ohm impedance. | |
| Apr 26, 2023 at 17:51 | comment | added | Spehro 'speff' Pefhany | Q2 collector bias current is determined by the ratio of base resistors, Vbe, power supply voltage and Re3. Vce is V2- (IeRe3+ IcRc2) ~= V2-Ic*(Re3+Rc2). Depending on what you are trying to achieve for output swing and output Z you might have to adjust several resistors, but Re3 would be a place to start. | |
| Apr 26, 2023 at 17:44 | comment | added | ChiefnBigNuts | So you'd suggest changing the base resistors for Q2? Is there any R value you think I should shoot for? Thanks in advance. | |
| Apr 26, 2023 at 17:39 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 4.0 |