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Chapter: Electronic Circuits - MOSFET Amplifiers

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NMOS Current Sources and Sinks

Characteristics of Current Sources

NMOS Current Sources and Sinks

 

Characteristics of Current Sources

·        A well controlled output current

·        Supplied current does not depend on output voltage and has High NortonResistance

·        Connect a voltage source to the gate of another MOSFET:



Hence, IREF depends on the supply voltage VDD. If the supply is a battery or similar device, then this will change over time, causing the reference current to also vary with time.

 

IOUT scales with IREF by W/L ratios of two MOSFETs



 

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