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Bjt differential amplier design

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Andetroy

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Hello everyone. I'm building a simple bjt diff amp with active current source loading. I plan on employing negative feedback for obvious reasons related to distortion among others. I do understand that on a resistor loaded amp, the common mode gain is modelled by BRc/ri+2(B+1)Re where Re is a resistor connected between VEE and da bjt emitters. My question is, upon replacing the collector resistors with active loads, is there a way i can model the diff gain and common mode gain? I'm sorry if this sounds stupid, im a beginner.
 

Hello everyone. I'm building a simple bjt diff amp with active current source loading. I plan on employing negative feedback for obvious reasons related to distortion among others. I do understand that on a resistor loaded amp, the common mode gain is modelled by BRc/ri+2(B+1)Re where Re is a resistor connected between VEE and da bjt emitters. My question is, upon replacing the collector resistors with active loads, is there a way i can model the diff gain and common mode gain? I'm sorry if this sounds stupid, im a beginner.
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Hi Andetroy

Welcome to the EDA forum .
No that is not stupid . all of us were a beginner . so it's ok .

It can be easily simulated via two different sine wave generators . which software are you using for modeling ? orcad perhaps ? ( one time in phase and the other time out of phase ) .
Best Wishes
Goldsmith
 

goldsmith said:
Hi Andetroy

Welcome to the EDA forum .
No that is not stupid . all of us were a beginner . so it's ok .

It can be easily simulated via two different sine wave generators . which software are you using for modeling ? orcad perhaps ? ( one time in phase and the other time out of phase ) .
Best Wishes
Goldsmith
Click to expand...

thank you for replying. I'm using PSIM(as a simulator).
 

thank you for replying. I'm using PSIM(as a simulator).
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Hi again
I'm not familiar with PSIM . i'm usually using Pspice . but the method is not different . use two sine wave inputs . your amp has two inputs . one of the times give both of them signals in phase and next time change phase of one of your sources .

Good Luck
Goldsmith
 

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