20 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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1 ECSE334 – Introduction to Microelectronics ECSE 334 Introduction to Microelectronics Roni Khazaka Lecture #20 ECSE334 – Introduction to Microelectronics 2 Khazaka - 2008 Frequency Compensation Example 1 A 2 A + i v o v Two Stage OpAmp DC gain: dB 60 2 1 = = A A A o Poles : MHz 100 MHz; 10 MHz; 1 3 2 1 = = = p p p f f f 1 2 Pole f p1 is formed at node 1, and pole f p2 is formed at node 2. V / V 50 1 = A V / V 20 2 = A
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2 ECSE334 – Introduction to Microelectronics 3 Khazaka - 2008 Frequency Compensation Example 1 A 2 A + i v o v Two Stage OpAmp 1 2 Compensate the opamp such that it is stable with phase margin of 45 ° when it is connected in feedback configuration with β =1. ECSE334 – Introduction to Microelectronics 4 Khazaka - 2008 Scheme #1: Add new dominant pole Î What is the frequency f D of the new pole? 9 10 8 10 7 10 6 10 5 10 4 10 10 20 30 40 50 60 3 10 2 10 Hz 1000 = D f 2 p f 1 p f 2 10
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3 ECSE334 – Introduction to Microelectronics 5 Khazaka - 2008 Scheme #2: 1 A 2 A + i v o v 1 2 Add Capacitor C c at node 1 to reduce frequency of first pole f p1 . c
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This note was uploaded on 01/27/2011 for the course ECSE 334 taught by Professor Anashamoui during the Spring '10 term at McGill.

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20 - ECSE 334 Introduction to Microelectronics Roni Khazaka...

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