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# BJT Input Diff-Amp Stage/Off-Set Voltage

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Define the offset voltage in the op-amp circuits. Show that the expression for the offset-voltage compensation of BJT input diff-amp stage shown in figure 4 is given by:

Vt*ln(ic1/Is3)+ic1R'1=Vt*ln(ic2/Is4)+ic2Rs'

Determine the value of x in the potentiometer to compensate for a mismatch between active load transistors Q3 and Q4. Assume Iq=200uA, Is3=10^-14A, Is4=1.1x10^-14A, R1-R2=2K, Rx=100K

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Hello,

Please find your solution in the attachment.
Note: To find a number for X, we need the V- value, I have assumed some value. Otherwise, X can be written in an expression, which is what I have in my solution.

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

Â© BrainMass Inc. brainmass.com December 24, 2021, 5:01 pm ad1c9bdddf>
https://brainmass.com/engineering/electrical-engineering/bjt-input-diff-amp-stage-off-set-voltage-22104