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+{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 6 : Field Effect Transistors"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.1, Page No. 184"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# drain resistance transconductance and amplification factor\n",
+ "\n",
+ "import math\n",
+ "from array import array\n",
+ "#Variable declaration\n",
+ "Vgs=array('d', [0.0, 0.0, 0.3]) #in V\n",
+ "Vds=array('d',[5.0, 10.0, 10.0]) #in V\n",
+ "Id=array('d',[8.0, 8.2, 7.6]) #in mA\n",
+ "\n",
+ "#Calcualtions\n",
+ "dVds=Vds[1]-Vds[0] #in V\n",
+ "dId=Id[1]-Id[0] #in mA\n",
+ "rd=(dVds/dId) #in kilo-ohm\n",
+ "dVgs=Vgs[2]-Vgs[1] #in V\n",
+ "dId1=Id[1]-Id[2] #in mA\n",
+ "gm=dId1/dVgs #in mA/volt\n",
+ "mu=gm*rd #A/V\n",
+ "\n",
+ "#Result\n",
+ "print(\"(i) A.C. Drain resistance is ,(kilo-ohm)= %.f\"%rd)\n",
+ "print(\"(ii) Transconductance is ,(mS) = %.f\"%gm)\n",
+ "print(\"(iii) Amplification factor is , = %.f\"%mu)\n",
+ "#Transconductance and Amplification factor are calculated wrong in the textbook"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(i) A.C. Drain resistance is ,(kilo-ohm)= 25\n",
+ "(ii) Transconductance is ,(mS) = 2\n",
+ "(iii) Amplification factor is , = 50\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.2, Page No. 184"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# mutual conductance\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "I1=1.0 # in mA\n",
+ "I2=1.2 # in mA\n",
+ "V1=-3.0 # in V\n",
+ "V2=-2.9 # in V\n",
+ "\n",
+ "#Calculations\n",
+ "del_ID=(I2-I1)\n",
+ "del_VGS=V2-V1 # in V\n",
+ "gm=del_ID/del_VGS\n",
+ "\n",
+ "#Result\n",
+ "print(\"mutual conductance,gm(mS) = %.f\"%gm)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "mutual conductance,gm(mS) = 2\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.3, Page No. 185"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# pinch off voltage\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "a=5.6*10**-6/2 # channel width in m\n",
+ "epsilon0=8.86*10**-12 # in F/m\n",
+ "epsilon=12*epsilon0 # in F/m\n",
+ "Nd=10**21 # in m^-3\n",
+ "e=1.6*10**-19 # in V\n",
+ "\n",
+ "#Calculations\n",
+ "Vp=e*Nd*a**2/(2*epsilon);\n",
+ "\n",
+ "#Result\n",
+ "print(\"Pinch off voltage,Vp(V) = %.1f\"%Vp)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Pinch off voltage,Vp(V) = 5.9\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.4, Page No. 185"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# ID gm and gmo\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "I_DES=8.7 # in mA\n",
+ "V1=-3.0 # in V\n",
+ "V_GS=-1.0 # in V\n",
+ "\n",
+ "\n",
+ "#Calculations\n",
+ "gmo=-(2*I_DES/V1)\n",
+ "ID=I_DES*(1-(V_GS/V1))**2\n",
+ "gm=gmo*(1-(V_GS/V1));\n",
+ "\n",
+ "#Result\n",
+ "print(\"(i). ID(mA) = %.3f\"%(math.floor(ID*1000)/1000))\n",
+ "print(\"(ii). gmo(mS) = %.1f\"%gmo)\n",
+ "print(\"(iii).gm(mA) = %.3f\"%(math.floor(gm*1000)/1000))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(i). ID(mA) = 3.866\n",
+ "(ii). gmo(mS) = 5.8\n",
+ "(iii).gm(mA) = 3.866\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.5, Page No. 186"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# Vgs\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "ID=3.0 # in mA\n",
+ "I_DSS=9.0 # in mA\n",
+ "Vp=-4.5 # in V\n",
+ "\n",
+ "#Calculations\n",
+ "Vgs=-Vp*(math.sqrt(ID/I_DSS)-1)\n",
+ "\n",
+ "\n",
+ "#Result\n",
+ "print(\"Vgs(V) = %.1f\"%Vgs)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Vgs(V) = -1.9\n"
+ ]
+ }
+ ],
+ "prompt_number": 25
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.6, Page No. 196"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# voltage amplification\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "gm=3 #Transconductance in mS\n",
+ "rl=10 #load resistance in kilo-ohm\n",
+ "\n",
+ "#Calculations\n",
+ "av=gm*rl\n",
+ "#Result\n",
+ "print(\"the voltage aplification is ,= %.f\"%av)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "the voltage aplification is ,= 30\n"
+ ]
+ }
+ ],
+ "prompt_number": 27
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6.7, Page No. 196"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "# output voltage\n",
+ "\n",
+ "import math\n",
+ "#Variable declaration\n",
+ "Rl=20.0 #in kilo-ohm\n",
+ "Rs=1.0 #in kilo-ohm\n",
+ "Rg=1.0 #in M-ohm\n",
+ "Cs=25.0 #in micro-F\n",
+ "mu=20.0 #amplification factor\n",
+ "rd=100.0 #in kilo-ohm\n",
+ "vi=2.0 #in V\n",
+ "f=1.0 #in kilo-Hz\n",
+ "\n",
+ "#Calculations\n",
+ "Xc=((1/(2*math.pi*f*10**3*Cs*10**-6)))\n",
+ "A=((mu*Rl*10**3)/((rd+Rl)*10**3))\n",
+ "Vo=A*vi\n",
+ "\n",
+ "#Result\n",
+ "print(\"amplifier output signal voltage is ,(V)= %.2f\"%(math.floor(Vo*100)/100))\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "amplifier output signal voltage is ,(V)= 6.66\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
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