Handout_9_-_Single_Stage_MOSFET_Amplifiers

Handout_9_-_Single_Stage_MOSFET_Amplifiers - EE 101A /...

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1 EE 101A / Winter 10 Handout #9 EE 101A Single Stage MOSFET Amplifiers Reading – Sedra & Smith, Chapter 1.5, Chapter 4.7 We have discussed the Common Source (CS) configuration as an example of MOSFET Amplifier. There are other basic configurations that we will discuss here. First, let’s consider the modeling of an amplifier. 1. Amplifier Models 1.1 Voltage Amplifier It is common to model the small signal (AC) behavior of an amplifier with the following network and parameters. This is similar to modeling the input and output terminals with their respective Thevenin network. Open Circuit Voltage Gain i o vo v v A when i o = 0 A vo in db = 20 log |A vo | Input Resistance i i i i v R when i o = 0 Output Resistance x x o i v R when v i = 0 (with the test circuit shown on right, input shorted to ground.) Power Gain A p P o P i v o i o v i i i A P in db = 10 log |A P | i i i o i o i i
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2 1.2 Current Amplifier In some applications, input and output currents are of interest, it is more convenient to model the amplifier with the following network (similar to Norton network). Short Circuit Current Gain i o is i i A when v o = 0 A is in db = 20 log |A is | Input Resistance i i i i v R when i o = 0 Output Resistance x x o i v R when i i = 0 (with the test circuit shown in page 1) Power Gain A p P o P i v o i o v i i i A P in db = 10 log |A P | 1.3 Transconductance and Transconductance Amplifiers The following alternative models may be more appropriate in some cases.
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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_9_-_Single_Stage_MOSFET_Amplifiers - EE 101A /...

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