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<@U01819B63HP> Will this have modelling issues since operating current is few pico amps

<@U07JY7WG2KH> Ngspice places by default 1e12 Ohm vs ground to all circuit nodes, to help convergence. If you are working in pA range you need to decrease GMIN:
.options GMIN=1e-16

<@U07JY7WG2KH> please check the order of write instructions, must be the following:
```.option savecurrents GMIN=1e-16
.temp 27
.control
  save all
  op
  write 2tbgr1try.raw
  set appendwrite
  dc temp -50 150 1
  write 2tbgr1try.raw
  plot v(Vref)
.endc```
this is what I get:

Also add ABSTOL=1e-16 in the .options line. This is the precision of the simulator for currents.

I think such current levels are too low for a reliable operation, but just my humble opinion.

I was trying to add a buffer for this to measure in tt, but even buffer mosfet gate will load this thing, Any suggestion regarding this?. Thank you