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{
"metadata": {
"name": "El5"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5: Junction Properties (Continued)"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 5.1 Page No 191"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Exa 5.1\n",
"#Estimate the junction width in two cases.\n",
"\n",
"#given data\n",
"import math\n",
"ND=10**17 #in atoms/cm**3\n",
"NA=0.5*10**16 #in atoms/cm**3\n",
"Vo=0.7 #in Volts\n",
"V=-10.0 #in Volts\n",
"ND=ND*10**6 #in atoms/m**3\n",
"NA=NA*10**6 #in atoms/m**3\n",
"epsilon=8.85*10**-11 #in F/m\n",
"e=1.6*10**-19 #coulamb\n",
"\n",
"#Calculation\n",
"#part (i)\n",
"#print \"When no external voltage is applied i.e. V=0\"\n",
"#print\"VB = 0.7 volts\"\n",
"VB=0.7 #in Volts\n",
"W1=math.sqrt(2*epsilon*VB*(1/NA+1/ND)/e) #in m\n",
"\n",
"#part (ii)\n",
"#print\"When external voltage of -10 volt is applied\"\n",
"#print\"VB = Vo-V volts\"\n",
"VB=Vo-V #in Volts\n",
"W2=math.sqrt(2*epsilon*VB*(1/NA+1/ND)/e) #in m\n",
"\n",
"#result\n",
"print \"When no external voltage is applied, Junction width is \",round(W1,8),\"m\"\n",
"print\"When external voltage of -10 Volt is applied, Junction width is \",round(W2,7),\"m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"When no external voltage is applied, Junction width is 3.9e-07 m\n",
"When external voltage of -10 Volt is applied, Junction width is 1.5e-06 m\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 5.3 Page No 195"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Exa 5.3\n",
"#Determine the junction capacitance\n",
"\n",
"#given data\n",
"CTzero=50 #in pF\n",
"VR=8 #in Volt\n",
"VK=0.7 #in Volt\n",
"n=1/3.0 #for Si\n",
"\n",
"#calculation\n",
"CT=CTzero/((1+VR/VK)**n) #in pF\n",
"\n",
"#result\n",
"print\"Junction capacitance is\",round(CT,2),\"pF\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Junction capacitance is 21.59 pF\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 5.4 Page No.196"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Example 5.4\n",
"#Determine the tuning range of the circuit\n",
"\n",
"#Given\n",
"L=12.5*10**-3 #mH inductance\n",
"C1=4.0 #pF Capacitance\n",
"C2=40.0 #pF Capacitance\n",
"\n",
"#Calculation\n",
"Ctmin=(C1*C1)/(C1+C1) #Min value of total Capacitance\n",
"Ctmax=(C2*C2)/(C2+C2) #Max value of total Capacitance\n",
"Fmax=1/(2*math.pi*math.sqrt(L*Ctmin*10**-12))\n",
"Fmin=1/(2*math.pi*math.sqrt(L*Ctmax*10**-12))\n",
"\n",
"#result\n",
"print\"The tuning range of circuit lies between\",round(Fmin/1000,2),\"khz and\",round(Fmax/1000,0),\"Mhz\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The tuning range of circuit lies between 318.31 khz and 1007.0 Mhz\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
