MIT6_012S09_lec23

MIT6_012S09_lec23 - Lecture 23 Frequency Response of...

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Unformatted text preview: Lecture 23 Frequency Response of Amplifiers (III) OTHER AMPLIFIER STAGES Outline 1. Frequency Response of the Common Drain Amplifie Common-Drain Amplifier 2. Frequency Response of the Common-Gate Amplifier 6.012 Spring 2009 Lecture 23 1 1. Frequency Response of the Common-Drain Amplifier V DD signal source v s V BIAS v OUT i SUP R S R L + signal load 6.012 Spring 2009 Lecture 23 2 • Voltage gain ≈ 1 • High input resistance • Low output resistance • ⇒ Good voltage buffer Characteristics of CD Amplifier: V BIAS V SS - High-frequency small-signal model G S-B D Could use OTC to solve for bandwidth. To estimate bandwidth it is easier to use the 2-port models. 6.012 Spring 2009 Lecture 23 3 Low Frequency Analysis Using 2-Port Model Capacitors-open circuit A vo = R in R S + R in (1) R L R L + R out ≈ g m R L 1 + g m R L ≤ 1 In the calculation of the intrinsic voltage gain we assume that r o ||r oc was large. That is why we do not have R L || r o ||r oc 6.012 Spring 2009 Lecture 23 4 High...
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This note was uploaded on 11/07/2011 for the course COMPUTERSC 6.012 taught by Professor Charlesg.sodini during the Spring '09 term at MIT.

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MIT6_012S09_lec23 - Lecture 23 Frequency Response of...

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