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{
"metadata": {
"name": "",
"signature": "sha256:a04d8bca9534fb9597d80a980e2f1b54e0ff54b9697a6bc1d33eb2c967636be8"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter7:TRANSFERRED ELECTRON DEVICES(TEDs)"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg7.2.1:pg-294"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the conductivity of the diode\n",
"e=1.6*(10**-19) #charge of electron in C\n",
"nl=(10**10)*(10**6) #electron density at lower valley in /m**3\n",
"nu=(10**8)*(10**6) #electron density at upper valley in /m**3\n",
"ul=8000*(10**-4) #electron mobility at lower valley in m2/V-sec\n",
"uu=180*(10**-4) #electron mobility at upper valley in m2/V-sec\n",
"o=e*((nl*ul)+(nu*uu)) \n",
"o=o*1000 #in milli mhos\n",
"print\"The conductivity of the diode(in mmhos)is=\",round(o,2),\"mmhos\" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"the conductivity of the diode(in mmhos)is= 1.28 mmhos\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg7.2.2:pg-298"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#(a)Calculate the electron drift velocity\n",
"q=1.6*(10**-19) #charge of electron in C\n",
"f=10*(10**9) #operating frequency in Hertz\n",
"L=10*(10**-6) #Device Length in meter\n",
"vd=f*L \n",
"print\"The electron drift velocity is =\",\"{:.0e}\".format(vd),\"m/s\",\"{:.0e}\".format(vd*100),\"cm/s\"\n",
"\n",
"#(b)Calculate the current density\n",
"n=2*(10**14)*(10**6) \n",
"J=q*n*vd \n",
"print\"The current density is =\",\"{:.1e}\".format(J),\"A/m2 =\",int(round(J/(10**4))),\"A/cm2\"\n",
"\n",
"#(c)CAPTION: Calculate the negative electron mobility\n",
"E=3200 #applied field\n",
"vd=vd*(100) #in cm/sec\n",
"un=-1*vd/E \n",
"print\"Negative electron mobility(in cm**2/V*sec) is =\",int(round(un)),\"cm2/V.s\" #answer is wrong in book "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The electron drift velocity is = 1e+05 m/s 1e+07 cm/s\n",
"The current density is = 3.2e+06 A/m2 = 320 A/cm2\n",
"Negative electron mobility(in cm**2/V*sec) is = -3125 cm2/V.s\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg7.3.1:pg-304"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Determine the criteria for classifying the modes of operation\n",
"er=13.1 #relative dielectric constant\n",
"vd=2.5*(10**5) #electron drift velocity in m/sec\n",
"e=1.6*(10**-19) #charge of electron in C\n",
"E=8.854*(10**-12)*er #permittivity of GaAs in F/m\n",
"un=-0.015 #negative electron mobility in m**2/v.s\n",
"un=-1*un\n",
"a=(E*vd)/(e*un)\n",
"print\"The criteria is=\",\"{:.3e}\".format(a),\"/m2 =\",\"{:.3e}\".format(a/10000),\"/cm2\" #calculation mistake in book \n",
"print\"This means that the product of doping concentration and the device length must be\"\n",
"print\"noL >\",\"{:.3e}\".format(a/10000),\"/cm2\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The criteria is= 1.208e+16 /m2 = 1.208e+12 /cm2\n",
"This means that the product of doping concentration and the device length must be\n",
"noL > 1.208e+12 /cm2\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg7.4.1:pg-311"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the output power\n",
"n=0.06 #conversion efficiency\n",
"M=3.5 #Multiplication factor\n",
"Eth=320*(10**3) #threshold field in V/m\n",
"L=12*(10**-6) #Device Length in m\n",
"n0=10**21 #Donor concentration in m**3\n",
"e=1.6*(10**-19) #charge of electron in C\n",
"v0=1.5*(10**5) #Average carrier velocity in m/sec\n",
"A=3*(10**-8) #Area m**2\n",
"p=n*(M*Eth*L)*(n0*e*v0*A) \n",
"p=p*1000 # in mW\n",
"print\"The output power(in mW)is=\",int(round(p)),\"mW\" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The output power(in mW)is= 581 mW\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
