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{
"metadata": {
"name": "",
"signature": "sha256:c7dc6b3d9590410d93237c02edc71fc080a2b941482564691379213f8d71b12e"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"6: Semiconductors"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.1, Page number 133"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V1=1.4; #voltage1(V)\n",
"V2=1.5; #voltage2(V)\n",
"I1=60; #forward current for 1.4V(mA)\n",
"I2=85; #forward current for 1.5V(mA)\n",
"\n",
"#Calculation\n",
"I1=I1*10**-3; #forward current for 1.4V(A)\n",
"I2=I2*10**-3; #forward current for 1.5V(A)\n",
"Rs1=V1/I1; #static resistance for 1.4V(ohm)\n",
"Rs2=V2/I2; #static resistance for 1.5V(ohm) \n",
"dV=V2-V1; #change in voltage(V)\n",
"dI=I2-I1; #change in current(A)\n",
"Rd=dV/dI; #dynamic resistance(ohm)\n",
"\n",
"#Result\n",
"print \"static resistance for 1.4V is\",round(Rs1,1),\"ohm\"\n",
"print \"static resistance for 1.5V is\",round(Rs2,1),\"ohm\"\n",
"print \"dynamic resistance is\",Rd,\"ohm\"\n",
"print \"answer for dynamic resistance given in the book is wrong\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"static resistance for 1.4V is 23.3 ohm\n",
"static resistance for 1.5V is 17.6 ohm\n",
"dynamic resistance is 4.0 ohm\n",
"answer for dynamic resistance given in the book is wrong\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.2, Page number 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"IE=1; #emitter current(mA)\n",
"IB=0.02; #base current(mA)\n",
"\n",
"#Calculation\n",
"IC=IE-IB; #collector current(mA)\n",
"beta=IC/IB; #value of beta\n",
"alpha=IC/IE; #value of alpha\n",
"\n",
"#Result\n",
"print \"value of beta is\",beta\n",
"print \"value of alpha is\",alpha"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"value of beta is 49.0\n",
"value of alpha is 0.98\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.3, Page number 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"alpha=0.99; #value of alpha\n",
"I_CBO=0.5; #value of ICBO(micro A)\n",
"\n",
"#Calculation\n",
"beta=alpha/(1-alpha); #value of beta\n",
"ICEO=1/(1-alpha)*I_CBO; #value of ICEO(micro A)\n",
"\n",
"#Result\n",
"print \"value of beta is\",beta\n",
"print \"value of ICEO is\",ICEO,\"micro A\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"value of beta is 99.0\n",
"value of ICEO is 50.0 micro A\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.4, Page number 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"delta_Ic=4.5-2; #change in collector current(mA)\n",
"delta_Ib=80-40; #change in base current(microA)\n",
"\n",
"#Calculation\n",
"delta_Ic=delta_Ic*10**-3; #change in collector current(A)\n",
"delta_Ib=delta_Ib*10**-6; #change in base current(A)\n",
"beta_AC=delta_Ic/delta_Ib; #value of beta\n",
"alpha_AC=beta_AC/(1+beta_AC); #value of alpha\n",
"\n",
"#Result\n",
"print \"value of beta is\",beta_AC\n",
"print \"value of alpha is\",round(alpha_AC,4)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"value of beta is 62.5\n",
"value of alpha is 0.9843\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.5, Page number 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"IE=1; #emitter current(mA)\n",
"Oc=0.04; #output current(mA)\n",
"\n",
"#Calculation\n",
"IC=1-Oc; #collector current(mA)\n",
"alpha=IC/IE; #value of alpha\n",
"\n",
"#Result\n",
"print \"current gain is\",alpha"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"current gain is 0.96\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 6.6, Page number 134"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"alpha=0.96; #current gain\n",
"R=1; #resistance(K ohm)\n",
"V=1.5; #voltage drop(V)\n",
"\n",
"#Calculation\n",
"IC=V/R; #collector current(mA)\n",
"IE=IC/alpha; #emitter current(mA)\n",
"IB=IE-IC; #base current(mA)\n",
"\n",
"#Result\n",
"print \"base current is\",IB,\"mA\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"base current is 0.0625 mA\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
