MOS current-steering circuits
A current
mirror may consist of many MOSFET
current sources This circuit is particularly useful in integrated circuit
design, where one resistor R is used to make multiple current sources the current mirror simply ensures that the
gate to source voltages of each
transistor is equal to the gate to
source voltage of the reference
·
Current
sink: pulls a
dc current from a circuit
·
Current
source: pushes a dc current into a circuit
·
All transistors should be operated in saturation
·
Current mismatch exists for a finite VA (channel-length modulation)
From the
standpoint of integrated circuit design, we can change the value of K by modifying the MOSFET channel width-to-length ratio (W/L)
for each transistor.
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