Design a circuit that will linearly convert an input voltage that ranges from 0 to 4V into a current that ranges from roughly 50 µA to 0. Simulate the operation of the design showing the linearity of...

Design a circuit that will linearly convert an input voltage that ranges from 0 to 4V into a current that ranges from roughly 50 µA to 0. Simulate the operation of the design showing the linearity of the voltage-to-current conversion. How does the MOSFET's length affect the linearity?

Using a PMOS device, discuss and show with simulations how it can be used to implement a 10k resistor. Are there any limitations to the voltage across the PMOS resistor? Explain.