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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