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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 12 JFETS"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.1 Page No 303"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The dc voltage from the drain to ground = 22.37 volts\n",
"The source voltage to ground = 12.00 volts\n"
]
}
],
"source": [
"# given data\n",
"R1= 20## kΩ\n",
"R2= 10## kΩ\n",
"R_E= 10## kΩ\n",
"R_D= 8.2## kΩ\n",
"V_G= 10## V\n",
"V_BE= 0.7## V\n",
"V_GS= -2## V\n",
"V_DD= 30## V\n",
"V_B= R2*V_DD/(R1+R2)## V\n",
"I_E= (V_B-V_BE)/R_E## mA\n",
"I_D= I_E## mA\n",
"# The dc voltage from the drain to ground \n",
"V_D= V_DD-I_D*R_D## V\n",
"# The source voltage to ground \n",
"Vs= V_G-V_GS## V\n",
"print \"The dc voltage from the drain to ground = %.2f volts\"%V_D\n",
"print \"The source voltage to ground = %.2f volts\"%Vs"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.2 Page No 307"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Part (i) When V_GS= -1\n",
"The value of gm = 3000.00 µS\n",
"Part (ii) When I_D= 2.5 mA\n",
"The value of gm = 1500.00 µS\n"
]
}
],
"source": [
"# given data\n",
"gmo= 3000## µmhoS\n",
"V_GSoff= -4## V\n",
"I_DSS= 10## mA\n",
"print \"Part (i) When V_GS= -1\"\n",
"V_GS= -1## V\n",
"# The value of gm \n",
"gm= gmo*(1-V_GS/V_GSoff)## µS\n",
"print \"The value of gm = %.2f µS\"%gm\n",
"print \"Part (ii) When I_D= 2.5 mA\"\n",
"I_D= 2.5## mA\n",
"# The value of gm \n",
"gm= gmo*2*I_D/I_DSS## µS\n",
"print \"The value of gm = %.2f µS\"%gm"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.3 Page No 311"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The output voltage = 12.79 mV\n"
]
}
],
"source": [
"# given data\n",
"gm= 2000## µS\n",
"gm=gm*10**-6## S\n",
"R_D= 4.7## kΩ\n",
"Vin= 2## mV\n",
"R_L= 10## kΩ\n",
"r_D= R_D*R_L/(R_D+R_L)## kΩ\n",
"r_D= r_D*10**3## Ω\n",
"A= gm*r_D## unit less\n",
"# The output voltage \n",
"Vout= A*Vin## mV\n",
"print \"The output voltage = %.2f mV\"%Vout\n",
"\n",
"# Note: The calculated value of A = %.2f the book is wrong. Correct value of A6.39, So the answer in the book is wrong."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.4 Page No 311"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The voltage gain = 0.84\n"
]
}
],
"source": [
"# given data\n",
"R_D= 7.5## kΩ\n",
"R_L= 3## kΩ\n",
"r_s= R_D*R_L/(R_D+R_L)## kΩ\n",
"r_s= r_s*10**3## Ω\n",
"gm= 2500*10**-6## S\n",
"# The voltage gain \n",
"A= gm*r_s/(1+gm*r_s)## unit less\n",
"print \"The voltage gain = %.2f\"%A"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.9"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
