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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 4: Junction Contd"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 4.12_1: Pinch_off_voltage.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 4.12.1\n",
"clc;\n",
"clear;\n",
"close;\n",
"// Given data\n",
"q = 1.6 * 10^-19;// in C\n",
"N_D = 10^15;// in electrons/cm^3\n",
"N_D = N_D * 10^6;// in electrons/m^3\n",
"epsilon_r = 12;\n",
"epsilon_o = (36 * %pi * 10^9)^-1;\n",
"epsilon = epsilon_o * epsilon_r;\n",
"a = 3 * 10^-4;// in cm\n",
"a = a * 10^-2;// in m\n",
"V_P = (q * N_D * a^2)/( 2 * epsilon);// in V\n",
"disp(V_P,'The Pinch off voltage in V is');\n",
"// V_GS = V_P * (1-(b/a))^2\n",
"b = (1-0.707) *a;// in m\n",
"disp(b*10^6,'The value of b in µm is : ')\n",
"disp('Hence the channel width has been reduced to about one third of its value for V_GS = 0');//\n",
"// Note : The unit of b in the book is wrong since the value of b is calculated in µm."
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 4.12_2: Value_of_VGS_and_VDS.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Exa 4.12.2\n",
"clc;\n",
"clear;\n",
"close;\n",
"// Given data\n",
"I_DSS = 8;// in mA\n",
"V_P = -4;// in V\n",
"I_D = 3;// in mA\n",
"V_GS = V_P * (1 - sqrt(I_D/I_DSS));// in V\n",
"disp(V_GS,'The value of V_GS in V is');\n",
"V_DS = V_GS - V_P;// in V\n",
"disp(V_DS,'The value of V_DS in V is');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 4.12_3: Drain_current.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Exa 4.12.3\n",
"clc;\n",
"clear;\n",
"close;\n",
"// Given data\n",
"V_P = -4;// in V\n",
"I_DSS = 9;// in mA\n",
"I_DSS = I_DSS * 10^-3;// in A\n",
"V_GS = -2;// in V\n",
"I_D = I_DSS * ((1 - (V_GS/V_P))^2);// in A\n",
"disp(I_D*10^3,'The drain current in mA is ');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 4.12_4: Value_of_transconductance.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Exa 4.12.4\n",
"clc;\n",
"clear;\n",
"close;\n",
"// Given data\n",
"I_DSS = 12;// in mA\n",
"I_DSS = I_DSS * 10^-3;// in A\n",
"V_P = -(6);// in V\n",
"V_GS = -(1);// in V\n",
"g_mo = (-2 * I_DSS)/V_P;// in A/V\n",
"g_m = g_mo * (1 - (V_GS/V_P));// in S\n",
"disp(g_m*10^3,'The value of transconductance in mS is');"
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 4.12_5: Transconductance_and_drain_current.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"//Exa 4.12.5\n",
"clc;\n",
"clear;\n",
"close;\n",
"// Given data\n",
"I_DSS = 10;// in mA \n",
"I_DSS = I_DSS * 10^-3;// in A\n",
"V_P = -(5);// in V\n",
"V_GS = -(2.5);// in V\n",
"g_m = ((-2 * I_DSS)/V_P) * (1 -(V_GS/V_P));// in S\n",
"g_m = g_m * 10^3;// in mS\n",
"disp(g_m,'The Transconductance in mS is');\n",
"I_D = I_DSS * ((1 - (V_GS/V_P))^2);// in A\n",
"disp(I_D*10^3,'The drain current in mA is'); "
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Scilab",
"language": "scilab",
"name": "scilab"
},
"language_info": {
"file_extension": ".sce",
"help_links": [
{
"text": "MetaKernel Magics",
"url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
}
],
"mimetype": "text/x-octave",
"name": "scilab",
"version": "0.7.1"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
