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A current mirror is a type of circuit that is used to replicate a current flowing through one device to another device. An n-MOS (n-type metal-oxide-semiconductor) current mirror is a current mirror that uses n-MOS transistors as the primary components.
In an n-MOS current mirror, the input current is applied to the gate of the input transistor, and the output current is taken from the drain of the output transistor. The gate-source voltage of the input transistor is used to control the drain current, and the drain-source voltage of the output transistor is used to control the output current.
The operation of an n-MOS current mirror is based on the fact that the drain current of an n-MOS transistor is proportional to its gate-source voltage, provided that the drain-source voltage is kept constant. The drain current of the output transistor is then proportional to the drain current of the input transistor.
n-MOS current mirrors are widely used in integrated circuits for various applications, such as current sources, voltage references, and active load devices. They are also used in power management circuits, where the output current is used to control the gate voltage of another MOSFET, allowing the control of the power delivered to the load.
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