Mathematica Asked on June 5, 2021
I have the following code:
q = 1.6*10^-19;
hbar := 6.63/(2*[Pi])*10^-34;
m0 = 9.1*10^-31;
kb = 1.38*10^-23;
Cap := 4.5*10^-3;
W := 50*10^-6;
mu := 4.3*10^-4;
n := 20;
vth = ((3*kb*300)/m0)^0.5;
vt := -3.5;
Rex := 15 ;
vg = 0;
Plot[id /.
FindRoot[(id - (Cap*W*mu*(n*vth)^2)/(
7*10^-6)*(PolyLog[2, -Exp[(vd - id - vg + vt)/(n*vth)]] -
PolyLog[2, Exp[(id - vg + vt)/(n*vth)]])), {id,
10^-6}], {vd, -1, .872}, ImageSize -> Large,
AxesLabel -> {vd, id}, LabelStyle -> {15, Bold, Black}]
It shows this error:
How can I specify the correct AccuracyGoal and PrecisionGoal for my problem. Also I want to plot the $id$ as a function of $vd$ for different $vg$, is there a way to automate it?
Maybe with some or all of these changes [update: changed starting points to complex numbers ±10^6(1±I)
]:
ReImPlot[ (* solution is complex-valued *)
id /. FindRoot[(id - (Cap*W*mu*(n*vth)^2)/(7*10^-6)*(PolyLog[
2, -Exp[(vd - id - vg + vt)/(n*vth)]] -
PolyLog[2, Exp[(id - vg + vt)/(n*vth)]])),
{id, Sign[vd] 10^6 + 10^6 I} (* better starting point *)
],
{vd, -10^8, 10^8}, (* larger plot domain *)
ImageSize -> Large, AxesLabel -> {vd, id},
LabelStyle -> {15, Bold, Black}]
Changing the starting point to Sign[vd] 10^6 - 10^6 I
gives conjugate solutions.
Answered by Michael E2 on June 5, 2021
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