Lecture_33

Lecture_33 - Lecture 33 Page 4 Finite Gain Limitations...

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EE 310 Lecture 33 Nonideal Effects in Operational Amplifiers Nonideal Characteristics: 1. A OL ≠ ∞ 2. R id ≠ ∞ 3. R O ≠ 0 4. i (+), i ( - ) ≠ 0 5. v O and v I have max/min limits 6. Speed is limited + - v I 1 v I 2 v O i (+) R id i ( - ) A OL R O Lecture 33 Page 1
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Nonideal Parameters To Be Studied Voltage Limitations 1. Finite Open-Loop Gain 2. Frequency Response and Bandwidth 3. Slew Rate 4. Input Offset Voltage 5. Input Bias and Offset Currents 6. Common-Mode Rejection 7. EE 310 Lecture 33 Lecture 33 Page 2
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Inside an Op Amp Bipolar CMOS EE 310 Lecture 33 Lecture 33 Page 3
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Voltage Limitations "Keep it between the rails" EE 310 Lecture 33
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Unformatted text preview: Lecture 33 Page 4 Finite Gain Limitations Previously derived (Lecture 28) A od = A OL = device gain A v = A CL = circuit gain Note: Symbols used in chapters 9 and 14 differ. EE 310 Lecture 33 Lecture 33 Page 5 Example If an op-amps open-loop gain is 5 x 10 4 V/V and R 2 / R 1 = 50 V/V, then find the actual closed-loop gain v O / v I . If the open-loop gain decreases 10%, then find the actual closed-loop gain v O / v I and the percentage change in closed-loop gain. EE 310 Lecture 33 Lecture 33 Page 6...
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Lecture_33 - Lecture 33 Page 4 Finite Gain Limitations...

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