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Diff amp with widlar current source

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laguna92651

Joined Mar 29, 2008
101
I designed the attached diff amp. Can't seem to get it to work in pspice. Am I using the correct source for the input? I also noticed the diff amp is loading down the current source from 5mA(designed value) to 2 mA when connected to the diff amp. I used Ad=gmRc/2 to calculate IR4 of 5mA.

The circuit requirements are:
20<=Ad<=30
Rid>=20kΩ
bias current = 5mA
Must use ±10v

Second question, how do I calculate max peak-to-peak output swing, and the max input voltage that can be applied without any distortion?
Thank you
 

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Thread Starter

laguna92651

Joined Mar 29, 2008
101
I see what I did wrong, I set up the input signal incorrectly.

In regards to the second question, how do I calculate max peak-to-peak output swing, and the max input voltage that can be applied without any distortion?
 
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