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REVIEW - Active Circuit Bode Plots

# REVIEW - Active Circuit Bode Plots - THINGS YOU SHOULD KNOW...

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REVIEW – Frequency response for active circuits Page 1 THINGS YOU SHOULD KNOW ABOUT BODE PLOTS FOR ACTIVE OP-AMP CIRCUITS (Lecture 40) 1. How to convert circuit to phasors and write transfer function. 2. How to express magnitude in decibels 3. How to plot terms of the form 20log 10 1 + j ! RC and 20log 10 j RC . 4. OP-AMP filters often have a constant gain term of the form 20log 10 K which shifts the total response vertically. 5. How to identify cutoff frequency and 3-db point. 6. Know the difference between ω and f. PAGE FREQUENCY RESPONSE FROM TRANSFER FUNC 2-3 LOW-PASS OP-AMP FILTER 4-5 HIGH-PASS OP-AMP FILTER 6-7 BAND-PASS OP-AMP FILTER 8-9

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REVIEW – Frequency response for active circuits Page 2 High-Pass Transfer Function (HW12 SPRING 2004) 12-9 You do not need to compute a transfer function for this circuit but simply need to plot its frequency dependence and understand its behavior. The transfer function is given to you as T j ! ( ) = 0.1 0.01 + 20 j Putting this into the standard form gives T V j ( ) = 10 j j + 2000 = j 0.005 ( ) 1 + j 0.0005 ( ) (a) This is a high-pass filter with a single cutoff frequency determined by the denominator. For frequencies above the cutoff frequency this circuit exhibits a gain K given by K = lim "# T V j ( ) = lim "# j 0.005 ( ) 1 + j 0.0005 ( ) = j 0.005
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REVIEW - Active Circuit Bode Plots - THINGS YOU SHOULD KNOW...

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