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{
"metadata": {
"name": "",
"signature": "sha256:e210474f5c4fc6668f4c7b5af2adf833a1c7f62577017a980ab8d11cd8ce2886"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"CHAPTER 7 : SPECIAL-PURPOSE DIODES"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1 : Page number 127-128\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"V_S=10.0; #Supply voltage in V\n",
"V_D=1.6; #Forward voltage drop of LED, in V\n",
"I_F=20.0; #Required limited current through LED, in mA\n",
"\n",
"#Calculations\n",
"R_S=(V_S-V_D)/(I_F/1000); #Series resistor required to limit the current through the LED, in \u2126\n",
"\n",
"#Result \n",
"print(\"The value of series resistor required to limit the current through the LED = %d \u2126.\"%R_S);\n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The value of series resistor required to limit the current through the LED = 420 \u2126.\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2: Page number 128"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"V_S=15.0; #Supply voltage in V\n",
"V_D=2.0; #Forward voltage drop of LED, in V\n",
"R_S=2200.0; #Series resistor required to limit the current through the LED, in \u2126\n",
"\n",
"#Calculations\n",
"I_F=((V_S-V_D)/R_S)*1000; #Required limited current through LED, in mA\n",
"\n",
"#Result \n",
"print(\"The current through the LED in the circuit = %.2f mA\"%I_F);\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The current through the LED in the circuit = 5.91 mA\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3: Page number 132-133"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"Ir=50.0; #Dark current as observed from the current Illumination curve, in mA \n",
"V_R=10.0; #Reverse voltage in V\n",
"\n",
"#Calculation\n",
"R_R=V_R/(Ir/pow(10,6)); #Dark Resistance in \u2126\n",
"\n",
"#Result\n",
"print(\"The dark resistance is=%d k\u2126\"%(R_R/1000));\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The dark resistance is=200 k\u2126\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.4: Page number 133"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"E=2.5; #Illumination in mW/cm\u00b2\n",
"m=37.4; #sensitivity of the photodiode in \ud835\udf07A/mW/cm\u00b2\n",
"\n",
"#Calculations\n",
"I_R=m*E; #Reverse current in \ud835\udf07A\n",
"\n",
"#Result\n",
"print(\"The reverese current in the photodiode = %.1f \ud835\udf07A\"%I_R);\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The reverese current in the photodiode = 93.5 \ud835\udf07A\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.5: Page number 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi\n",
"from math import sqrt\t\n",
"#Variable declaration\n",
"L=1.0; #Inductance of the inductor in mH\n",
"C=100.0; #Capacitance of the varactor in pF\n",
"\n",
"#Result\n",
"f_r=1/(2*pi*sqrt(L*pow(10,-3)*C*pow(10,-12))); #Resonant frequency of the circuit in Hz\n",
"f_r=f_r/1000; #Resonant frequency of the circuit in kHz\n",
"\n",
"#Result\n",
"print(\"The resonant frequency of the circuit = %.1f kHz\"%f_r);\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The resonant frequency of the circuit = 503.3 kHz\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
