Lecture_37

# Lecture_37 - Modeling Input Bias and Offset Currents and...

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Modeling Input Bias and Offset Currents and Offset Voltage + - V O error Example: I B = 100 nA I OS = 20 nA What are I B 1 , I B 2 values? EE 310 Lecture 37 v O _ + ( - ) + - I B 1 I B 2 Ideal ( + ) V OS Lecture 37 Page 1

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Bias Current Compensation Consider the circuit shown. Solve for v O as a function of the two bias currents using superposition. EE 310 Lecture 37 Lecture 37 Page 2
Bias Current Compensation (Continued) Solve for v O as a function of the two bias currents if I B 1 and I B 2 differ. EE 310 Lecture 37 Lecture 37 Page 3

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Example If I B = 1 μ A and I OS = 0 A, find the value of R 4 that compensates for the effect of input bias currents.

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