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MOSFET amplifier

The diagram above shows a very simple MOSFET amplifier. T1 is an depletion N-channel MOSFET. Assume its datasheet tells us that the VGS threshold voltage is -2V, and that yFS=10mA/V at VGS=0V. If R1=470Ω, the gain will be 10mA/V∙470Ω = 4.7.

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