Question

Draw schematic for any current source using MOSFETs and explain its operation. You might back up your discussion with equations or some example calculations.

Answer 1

cant draw it for u but

Step-by-step explanation:

A MOSFET can be used as a current source by operating it in the saturation region. In this region, the MOSFET behaves like a voltage-controlled current source, with the drain current being proportional to the gate-source voltage. By setting the gate-source voltage to a fixed value, the drain current can be held constant.

To create a MOSFET current source, a resistor is typically placed in series with the drain to limit the current. The gate is connected to a voltage source that sets the desired drain current. The voltage across the resistor will be equal to the difference between the input voltage and the gate-source voltage. This voltage divided by the resistance will give the output current.

The equation for the drain current in the saturation region is given by:

I_D = (1/2) * k' * (W/L) * (V_GS - V_TH)^2

where I_D is the drain current, k' is the MOSFET transconductance parameter, W/L is the width-to-length ratio of the MOSFET, V_GS is the gate-source voltage, and V_TH is the threshold voltage.

By setting the gate-source voltage to a fixed value, the drain current can be held constant. The resistor in series with the drain can be chosen to limit the current to a desired value.

Overall, a MOSFET current source is a simple and effective way to generate a constant current.

sorry if this doesnt help ;o