How to realize a MOS resistor?

[cheenu_2002]

Hi,
I am trying to use a MOSFET in place of a resistor. I am new to ckt design and I am finding it very difficult to bias it. Can anyone help me to understand how to bias a MOS in linear region so that it can act as a resistor. I used the ckt attached but I dont know if its the correct way to connect the MOS... I also dont know how to measure the Vbe of the BJT in the ckt. Both base and emitter are showing the same voltages. I cudnt understand whats happening.

 

[ankitgarg0312]

assuming that u are using a nmos here,

u have connected a drain and gate together, so this is diode configuration
this device will be always in saturation as vds=vgs (saturation condition: vds >= vgs-vt)

disconnect drain and gate and put a seperate supply for gate then bias ckt to get mos in linear