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How can I increase the current in all Vgs intervals by 1 mA?

yysunj

Dear everyone,

Figure 1 and Figure 2 are my circuit and Vgs-Id characteristic, respectively.  

verilogtutorial_2 is BSIM-BULK mosfet, and s is source, g is gate, d is drain, and b is bulk, respectively.

                                                                                                                                                         

Figure 1. BSIM-BULK mosfet schematic                                      

Figure 2. Vgs-Id characteristics of Figure 1

I want to know the method that increases the current in all Vgs intervals by 1 mA.

What should I do?

Thank you

yysunj

  • I don't understand your question. The current is defined by the model - if you need it to be higher, you'd need to change the model (or the model parameters). I could achieve the same thing with a built-in bsimbulk example:

    //

    // minimal model - default parameters
    model nch bsimbulk type=n

    Vgs (g 0) vsource dc=3.3
    Vds (d 0) vsource dc=3.3
    // increase w/l to increase current
    M1 (d g 0 0) nch w=2u l=1u

    dc dc dev=Vgs param=dc start=-20 stop=20 step=0.5
    save M1:d

    (this could have been done as a schematic of course - I just did it as a netlist for ease of sharing and experimentation as it's fully self-contained).

    With this example, if I increase the w/l (increase w or decrease l) the current will increase. There are of course numerous other parameters that would affect the current, but I don't know what your goal is here.

    Andrew

  • in reply to Andrew Beckett

    Thank you for your detailed reply.

    I'm wondering if adding a current source to Figure 1 can raise the Id over the entire range of Vgs by 1 mA as I said.

    Thank you

    yysunj

  • in reply to yysunj

    You could certainly add a 1mA current source in parallel with the transistor (i.e. between the drain and the source) - I don't really understand why that would be useful though.

    Andrew.

  • in reply to Andrew Beckett

    Thank you for your detailed reply.

    yysunj

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