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{
"metadata": {
"name": "",
"signature": "sha256:e62a104ff81010a41974070c37970149915a1689606735dc017583e29241aaa5"
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter19-PN-Junction Diode"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1-pg571"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 19.1\n",
"##calculation of potential barrier\n",
"\n",
"##given values\n",
"e=1.6*10**-19.;\n",
"n=4.4*10**28.;##no of atoms per m**3\n",
"kT=.026*e;##temp eqvlnt at room temp\n",
"ni=2.4*10**19.;##no of intrinsic carriers per m**3\n",
"NA=n/10**6.;##no of acceptors\n",
"ND=n/10**6.;##no of donors\n",
"\n",
"##calculation\n",
"V=(kT/e)*math.log(NA*ND/ni**2);\n",
"print'%s %.2f %s'%('potential barrier in volts is',V,'');\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"potential barrier in volts is 0.39 \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2-pg578"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 19.2\n",
"##calculation of current\n",
"\n",
"##given values\n",
"e=1.6*10**-19.;\n",
"kT=.026*e;##temp eqvlnt at room temp\n",
"Io=2*10**-7;##current flowing at room temp in A\n",
"V=.1;##forward bias voltage in volts\n",
"\n",
"##calculation\n",
"I=Io*(math.e**(e*V/kT)-1);##in Ampere\n",
"print'%s %.2f %s'%('current flowing when forward bias applied(in microampere)is',I*10**6,'');\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"current flowing when forward bias applied(in microampere)is 9.16 \n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
