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{
"metadata": {
"name": "",
"signature": "sha256:d1145daae7a009dc147f6efee5af89bfe5d87a34b4299d2e73cdea767a001b6c"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter8:AVALANCHE TRANSIT-TIME DEVICES"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg8.2.1:pg-331"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#(a)Calculate the maximum CW power\n",
"n=0.15 #efficiency\n",
"Vomax=100 #maximum operating voltage in volt\n",
"Iomax=200*(10**-3) #maximum operating current in ampere\n",
"Pdc=Vomax*Iomax \n",
"P=n*Pdc \n",
"print\"The maximum CW power(in Watts)is =\",int(P),\"W\"\n",
"\n",
"#(b) Calculate the resonant frequency\n",
"L=6*(10**-6) #drift-region Length in meter\n",
"vd=2*(10**5) #carrier drift velocity in m/s\n",
"f=vd/(2*L) \n",
"f=f/(10**9) #in GHz\n",
"print\"The resonant frequency(in GHz)is =\",round(f,2),\"GHz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The maximum CW power(in Watts)is = 3 W\n",
"The resonant frequency(in GHz)is = 16.67 GHz\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg8.3.1:pg-334"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the avalanche-zone velocity\n",
"J=20*(10**3) #current density in A/cm**2\n",
"q=1.6*(10**-19) #charge of electron in C\n",
"NA=2*(10**15) #Doping Concentration in /cm**3\n",
"vs=J/(q*NA) \n",
"print\"Avalanche-zone velocity(in cm/s)is =\",\"{:.2e}\".format(vs),\"cm/s\"\n",
"\n",
"print('This means that the avalanch-zone velocity is much larger than the scattering-limited velocity') "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Avalanche-zone velocity(in cm/s)is = 6.25e+07 cm/s\n",
"This means that the avalanch-zone velocity is much larger than the scattering-limited velocity\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg8.4.1:pg-338"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#(a) Calculate the break down voltage\n",
"q=1.6*(10**-19) #charge of electron\n",
"N=2.8*(10**21) #Donor Concentration /m**3\n",
"L=6*(10**-6) #silicon length in meter\n",
"er=11.8 #Relative dielectric constant of silicon\n",
"es=8.854*(10**-12)*er #permittivity of silicon in F/m\n",
"Vbd=(q*N*(L**2))/es \n",
"print\"The break down voltage(in Volts) is =\",round(Vbd,2),\"V\" \n",
"\n",
"#(b)Calculate the break down electric field\n",
"Ebd=Vbd/L \n",
"print\"the break down electric field is =\",\"{:.3e}\".format(Ebd),\"V/m =\",\"{:.3e}\".format(Ebd/100),\"V/cm\" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The break down voltage(in Volts) is = 154.37 V\n",
"the break down electric field is = 2.573e+07 V/m = 2.573e+05 V/cm\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Eg8.5.1:pg-346"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#(a)Calculate the power gain in decibels\n",
"R=25 #R=f0/fs ,ratio of output frequency over signal frequency\n",
"yQ=10 #figure of merit\n",
"x=((yQ)**2)/R \n",
"PG=(R*x)/((1+sqrt(1+x))**2) \n",
"PG=10*math.log10(PG) #calculating in dB\n",
"print\"The power gain (in dB)is =\",round(PG,3),\"dB\" \n",
"\n",
"#(b)Calculate the noise figure in decibels\n",
"\n",
"Td=350 #Diode temperature in degree Kelvin\n",
"To=300 #ambient Temperature in degree Kelvin\n",
"F=1+(((2*Td)/To)*((1.0/yQ)+(1.0/yQ**2)))\n",
"F=10*log10(F) #calculating in dB\n",
"print\"The noise figure (in dB)is =\",int(round(F)),\"dB\"\n",
"\n",
"#(c)Calculate the band width\n",
"y=0.4 #factor of merit figure\n",
"BW=2*y*sqrt(R) #R=fo/fs\n",
"print\"The band width is =\",int(BW)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The power gain (in dB)is = 9.8 dB\n",
"The noise figure (in dB)is = 1 dB\n",
"The band width is = 4\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
