Handout_7_-_MOSFET_Amplifier_-_DC_Analysis

Handout_7_-_MOSFET_Amplifier_-_DC_Analysis - EE 101A /...

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1 EE 101A / Winter 10 Handout #7 EE 101A MOSFET Amplifier – DC Analysis Reading – Sedra & Smith, Chapter 1.4, Chapter 4.4 – 4.5 1. Motivation Amplification is an essential capability of today’s electronic systems, digital and analog. voltage gain A v v o v i A v in decibel (db) = 20 log A v current gain i o i i i A A i in db = 20 log A i power gain i i o o i o p i v i v p p A = A v A i A p in db = 10 log A p Voltage Buffer A v 1 , A i >> 1 , A p >> 1 Current Buffer A v >> 1 , A i 1 , A p >> 1 i i i o + v i - + v o -
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2 In practice, the transfer characteristic of the amplifier may not be as ideal as that shown in the previous page. A DC input voltage is needed to bias the circuit to operate at a point (bias point, operating point, quiescent point) of the transfer characteristic where the voltage gain is high (i.e., slope is steep). The input and output voltages will have both DC and AC components. v I = V I + v i v O = V O + v o The gains defined in the previous page will apply only to the AC components. e.g., voltage gain A v v o v i The voltage gain can be determined as the slope of the transfer characteristic. voltage gain I O v dv dv A
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3 2. Common Source Amplifier The amplifier shown, with the source connected to ground (common), is the most basic amplifier.
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This note was uploaded on 03/30/2010 for the course EE 101A taught by Professor Wong during the Winter '08 term at Stanford.

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Handout_7_-_MOSFET_Amplifier_-_DC_Analysis - EE 101A /...

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