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# xschem

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01/15/2025, 9:17 AM

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Jnanapurushothama

01/15/2025, 12:18 PM

@Stefan Schippers Will this have modelling issues since operating current is few pico amps

Stefan Schippers

01/17/2025, 2:03 AM

@Jnanapurushothama 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

Stefan Schippers

01/17/2025, 2:15 AM

@Jnanapurushothama please check the order of write instructions, must be the following:

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.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:

Stefan Schippers

01/17/2025, 2:43 AM

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

Stefan Schippers

01/17/2025, 2:43 AM

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Stefan Schippers

01/17/2025, 2:49 AM

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

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Jnanapurushothama

01/17/2025, 2:59 AM

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

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