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Recent content by Raghuram TR

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    Non-LInear Capacitor SImulation - Time step too small error - LTSpice

    Thats intended. The design specs give capacitors in the range of femto farads.
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    Non-LInear Capacitor SImulation - Time step too small error - LTSpice

    Dear all, I am trying to simulate a Non-Linear capacitor in LTSpice whose voltage is a non-linear function of the charge across it. Please find the schematic attached below. However, I am getting Time step too small; initial timepoint: trouble with node "v_a" error. Can you please help me in...
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    Verilog-A simulation

    Hi, I have a Verilog-A code snippet for MOSFET, but I do not know where (any good free Verilog-A Simulators) and how to simulate the code to get the VI chara of the device. Could someone please explain the steps? Regards, Raghu
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    How to add new parameters to a MOSFET SPICE model file?

    Hi Erikl and dick_freebird, Thank you both :). Erikl, the paper (Modelling H+ - Sensitive FETs with SPICE) you gave is the one which I wish to implement in traditional SPICE. The model card parameters are given. But my doubt is where is the equation relating these parameters present in SPICE...
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    How to add new parameters to a MOSFET SPICE model file?

    Hi Erikl, I wish to model Ion Sensitive Field Effect Transistor (ISFET) in SPICE. I have Tanner Tool (T-SPICE). The equations related to ISFET have some additional parameters (Electrolyte parameters) in the standard MOSFET equations. So how can I go for it here? Raghu.
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    How to add new parameters to a MOSFET SPICE model file?

    Hi, I need to add new additional parameters to the existing MOSFET model file in SPICE and thus obtain the VI characteristics and other plots for this new device? How can I achieve it? Can someone please explain me the steps to do this? Also, please suggest the SPICE Tools which support this...
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    [SOLVED] PN Junction - Do immobile ions attract charge carriers?

    Now am clear about this. Thank you Ratch and Ibkay.
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    [SOLVED] PN Junction - Do immobile ions attract charge carriers?

    Hi Ratch, Just to make it very clear, so you mean the "Negative immobile ions" in P region is Strong enough to repel the electrons in the N region from getting attracted to the "Positive immobile ions" in the N region? And so the barrier formed under equilibrium will not stop/reduce this...
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    [SOLVED] PN Junction - Do immobile ions attract charge carriers?

    Hi all, I have a doubt in PN Junction under equilibrium condition. When the space charge region is formed with immobile ions, lets say, +ve ions in the n-region. Do these ions attract electrons (majority carriers) in the n-region? If not, why? Regards, Raghu
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