1EE 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 1.1Voltage 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 iovovvAwhen io= 0Avoin db = 20 log |Avo| Input Resistance iiiivRwhen io= 0Output Resistance xxoivRwhen vi= 0 (with the test circuit shown on right, input shorted to ground.) Power Gain ApPoPivoioviiiAPin db = 10 log |AP| iiioioii
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