2010_7.4 Other Nonideal Characteristics of Diff AmpLecture24

2010_7.4 Other Nonideal Characteristics of Diff...

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Unformatted text preview: EE 311 & EEO 311 EE 311 & EEO 311 Electronics 2 Electronics 2 Lecture 25 March 15, 2010 Lecture 25 March 15, 2010 Lecture 26, March 17, 2010 Lecture 26, March 17, 2010 7.4 Other Nonideal 7.4 Other Nonideal Characteristics Of The Characteristics Of The Differential Amplifier Differential Amplifier Input Offset Voltage V OS V C1 = V CC- R C1 I C1 & V C2 = V CC- R C2 I C2 V o = V C2- V C1 = - R C2 I C2 + R C1 I C1 Case 1 Q1 = Q2, but R C1 does not equal R C2 I C1 = I C2 = I C R C1 = R C2 + R C V o = -R C2 I C + (R C2 + R)I C = RI C I C = I E = (I/2) V o = ( I / 2) R C To Obtain Input Offset Voltage Divide by Differential Gain A d (A d = g m R C ) V os = V o / A d = [( I/2) R C ] / [g m R C ] g m = I C / V T = ( I/2) / V T V os = [( I/2) R C ] / [(( I/2) / V T ) R C ] = V T * ( R C / R C ) V os Applied to Input (with proper sign) can make V o = 0 If V O = V C2 V C1 < 0 Make V B1- V B2 > 0 &...
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2010_7.4 Other Nonideal Characteristics of Diff...

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