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+{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 6 Common-Emitter Approximations"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.2 Page No 153"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The total voltage across the 10 Ω resistance = 9.99 mV is :\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "R1= 10.0## Ω\n",
+ "R2= 10010## Ω\n",
+ "V1= 10## V\n",
+ "# The total voltage across the 10 Ω resistance \n",
+ "V= R1/R2*V1## V\n",
+ "V= V*10**3## mV\n",
+ "print \"The total voltage across the 10 Ω resistance = %.2f mV is :\"%V"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.3 Page No 156"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 3,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The total current through diode = 57.20 µA\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "R= 10*10**3## Ω\n",
+ "V_CC= 15## V\n",
+ "V_BE= 0.7## V\n",
+ "Vt= 25*10**-3## V\n",
+ "Vp= 1*10**-3## V\n",
+ "I= (V_CC-V_BE)/R## A\n",
+ "r_ac= Vt/I## Ω\n",
+ "# The total current through diode \n",
+ "Ip= Vp/r_ac## A\n",
+ "Ip= Ip*10**6## µA\n",
+ "print \"The total current through diode = %.2f µA\"%Ip"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.4 Page No 162"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The output voltage = 381.26 mV\n",
+ "The input impedance of amplifier = 4.14 kΩ\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "R1= 47*10**3## Ω\n",
+ "R2= 15*10**3## Ω\n",
+ "R_E= 8.2*10**3## Ω\n",
+ "R_C= 10*10**3## Ω\n",
+ "R3= 3.3*10**3## Ω\n",
+ "bita= 200#\n",
+ "V_CC= 30## V\n",
+ "V_BE= 0.7## V\n",
+ "Vin= 5*10**-3##in V\n",
+ "Vt= 25*10**-3## V\n",
+ "V2= R2*V_CC/(R1+R2)## V\n",
+ "# DC voltage across emitter\n",
+ "V_E= V2-V_BE## V\n",
+ "# Emitter current\n",
+ "I_E= V_E/R_E## A\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "r_L= R_C*R3/(R_C+R3)##in Ω\n",
+ "A= r_L/r_desh_e#\n",
+ "# The output voltage \n",
+ "Vout= A*Vin## V\n",
+ "Zin_base= bita*r_desh_e## Ω\n",
+ "# The input impedance of amplifier \n",
+ "Zin= R1*R2*Zin_base/(R2*Zin_base+R1*Zin_base+R1*R2)## Ω\n",
+ "Vout= Vout*10**3## mV\n",
+ "Zin= Zin*10**-3## k ohm\n",
+ "print \"The output voltage = %.2f mV\"%Vout\n",
+ "print \"The input impedance of amplifier = %.2f kΩ\"%Zin"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.5 Page No 163"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 5,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The base voltage = 1.80 V\n",
+ "The collector voltage = 6.04 V\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "R1= 10*10**3## Ω\n",
+ "R2= 2.2*10**3## Ω\n",
+ "R_C= 3.6*10**3## Ω\n",
+ "V_CC= 10## V\n",
+ "I_C= 1.1*10**-3## A\n",
+ "# The base voltage \n",
+ "V_B= R2*V_CC/(R1+R2)## V\n",
+ "# The collector voltage \n",
+ "V_C= V_CC-I_C*R_C## V\n",
+ "print \"The base voltage = %.2f V\"%V_B\n",
+ "print \"The collector voltage = %.2f V\"%V_C"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.6 Page No 164"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 6,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The output voltage = 158.40 mV\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "V2= 1.1## V\n",
+ "Vin= 1*10**-3## V\n",
+ "Vt= 25*10**-3## V\n",
+ "R2= 1*10**3## Ω\n",
+ "R_C= 3.6*10**3## Ω\n",
+ "I_E= V2/R2## A\n",
+ "# Emitter diode ac resistance\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "A= R_C/r_desh_e#\n",
+ "# The output voltage \n",
+ "Vout= A*Vin## V\n",
+ "Vout= Vout*10**3## mV\n",
+ "print \"The output voltage = %.2f mV\"%Vout"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.7 Page No 167"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 8,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The minimum voltage gain = 89.00\n",
+ "The maximum voltage gain = 178.00\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "R_C= 10*10**3## Ω\n",
+ "R_L= 82*10**3## Ω\n",
+ "r_E= 1*10**3## Ω\n",
+ "r_desh_e_min= 50## Ω\n",
+ "r_desh_e_max= 100## Ω\n",
+ "r_L= R_C*R_L/(R_C+R_L)## Ω\n",
+ "# The minimum voltage gain \n",
+ "A_min= r_L/r_desh_e_max#\n",
+ "# The maximum voltage gain \n",
+ "A_max= r_L/r_desh_e_min#\n",
+ "print \"The minimum voltage gain = %.2f\"%A_min\n",
+ "print \"The maximum voltage gain = %.2f\"%A_max"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.8 Page No 169"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 9,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The input impedance of the amplifier = 10.79 kΩ\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "bita= 200#\n",
+ "R1= 47*10**3## Ω\n",
+ "R2= 15*10**3## Ω\n",
+ "r_E= 1*10**3## Ω\n",
+ "r_desh_e= 50## Ω\n",
+ "Zin_base= bita*(r_E+r_desh_e)## Ω\n",
+ "# The input impedance of the amplifier \n",
+ "Zin= R1*R2*Zin_base/(R1*R2+R1*Zin_base+R2*Zin_base)## Ω\n",
+ "Zin= Zin*10**-3## k ohm\n",
+ "print \"The input impedance of the amplifier = %.2f kΩ\"%Zin"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.9 Page No 171"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 10,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The input impedance of each stage = 1.18 kΩ\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "bita= 150#\n",
+ "R1= 10*10**3## Ω\n",
+ "R2= 2.2*10**3## Ω\n",
+ "R_E= 1*10**3## Ω\n",
+ "V_CC= 10## V\n",
+ "V_BE= 0.7## V\n",
+ "Vt= 25*10**-3## V\n",
+ "V_B= R2*V_CC/(R1+R2)## V\n",
+ "V_E= V_B-V_BE## V\n",
+ "# The emitter current,\n",
+ "I_E= V_E/R_E## A\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "Zin_base= bita*r_desh_e## Ω\n",
+ "# The input impedance of each stage \n",
+ "Zin= R1*R2*Zin_base/(R1*R2+R1*Zin_base+R2*Zin_base)## Ω\n",
+ "Zin= Zin*10**-3## k ohm\n",
+ "print \"The input impedance of each stage = %.2f kΩ\"%Zin"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.10 Page No 172"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 11,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The ac output voltage across the final load resistor = 0.99 volts\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "bita= 150#\n",
+ "R1= 10*10**3## Ω\n",
+ "R2= 2.2*10**3## Ω\n",
+ "R_E= 1*10**3## Ω\n",
+ "Rs= 1*10**3## Ω\n",
+ "R_C= 3.6*10**3## Ω\n",
+ "R_L= 1.5*10**3## Ω\n",
+ "V_CC= 10## V\n",
+ "V_BE= 0.7## V\n",
+ "Vt= 25*10**-3## V\n",
+ "Vin= 1*10**-3## V\n",
+ "V_B= R2*V_CC/(R1+R2)## V\n",
+ "V_E= V_B-V_BE## V\n",
+ "I_E= V_E/R_E## A\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "Zin_base= bita*r_desh_e## Ω\n",
+ "Zin= R1*R2*Zin_base/(R1*R2+R1*Zin_base+R2*Zin_base)## Ω\n",
+ "Vb1= Zin*Vin/(Rs+Zin)## V\n",
+ "r_L= R_C*Zin/(R_C+Zin)## Ω\n",
+ "V_B= R2*V_CC/(R1+R2)## V\n",
+ "V_E= V_B-V_BE## V\n",
+ "I_E= V_E/R_E## A\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "A1= r_L/r_desh_e#\n",
+ "Vb2= A1*Vb1## V\n",
+ "r_L= R_C*R_L/(R_C+R_L)## Ω\n",
+ "A2= r_L/r_desh_e#\n",
+ "# The ac output voltage across the final load resistor \n",
+ "Vout= A2*Vb2## V\n",
+ "A= A1*A2#\n",
+ "Vout= A*Vb1## V\n",
+ "print \"The ac output voltage across the final load resistor = %.2f volts\"%Vout"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 6.11 Page No 173"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 12,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "The ac voltage at the final output = 18.77 mV\n"
+ ]
+ }
+ ],
+ "source": [
+ "# given data\n",
+ "bita= 150#\n",
+ "R1= 10*10**3## Ω\n",
+ "R2= 2.2*10**3## Ω\n",
+ "R_C= 3.6*10**3## Ω\n",
+ "Rs= 1*10**3## Ω\n",
+ "R_L= 1.5*10**3## Ω\n",
+ "r_E= 180## Ω\n",
+ "R_E= 1*10**3## Ω\n",
+ "V_CC= 10## V\n",
+ "V_BE= 0.7## V\n",
+ "Vt= 25*10**-3## V\n",
+ "Vin= 1*10**-3## V\n",
+ "V_B= R2*V_CC/(R1+R2)## V\n",
+ "V_E= V_B-V_BE## V\n",
+ "I_E= V_E/R_E## A\n",
+ "r_desh_e= Vt/I_E## Ω\n",
+ "Zin_base= bita*(r_desh_e+r_E)## Ω\n",
+ "Zin= R1*R2*Zin_base/(R1*R2+R1*Zin_base+R2*Zin_base)## Ω\n",
+ "r_L= R_C*Zin/(R_C+Zin)## Ω\n",
+ "A1= r_L/(r_E+r_desh_e)#\n",
+ "r_L= R_C*R_L/(R_C+R_L)## Ω\n",
+ "A2= r_L/(r_desh_e+r_E)#\n",
+ "A= A1*A2#\n",
+ "Vb1= Zin*Vin/(Rs+Zin)## V\n",
+ "# The ac voltage at the final output \n",
+ "Vout= A*Vb1## V\n",
+ "Vout= Vout*10**3## mV\n",
+ "print \"The ac voltage at the final output = %.2f mV\"%Vout"
+ ]
+ }
+ ],
+ "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
+}
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