{
"metadata": {
"name": "",
"signature": "sha256:cba451428c3d9c574800bbc1429b7e9efcd18af4b82f735faf4ac85b4ea52c65"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter02:The 741 IC OP-AMP"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.1:Pg-80"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 2.1\n",
"\n",
"# data from fig of Ex2.1\n",
"VCC=5.0;#V\n",
"IS=10**-14.0;#A\n",
"RS=39*1000.0;#ohm\n",
"VBE12=0.7;#V(Assumed)\n",
"VBE11=0.7;#V(Assumed)\n",
"VEE=-5;#V\n",
"IREF=(VCC-VBE12-VBE11-VEE)/RS*10**6;#micro A\n",
"print \"Estimated input reference current , IREF(micro A)\",round(IREF,2)\n",
"VT=25*10**-3;#V(Thermal Voltage)\n",
"VBE=VT*log(IREF*10**-6/IS);#V\n",
"IREF=(VCC-VBE-VBE-VEE)/RS*10**6;#micro A\n",
"print \"More precise value of reference current , IREF(micro A)\",round(IREF,2)\n",
"#Replacing Vcc by 15 V in the original design\n",
"VCC2=15.0;#V\n",
"VEE2=-15.0;#V\n",
"IREF=(VCC2-VBE-VBE-VEE2)/RS*10**6;#micro A\n",
"VBE=VT*log(IREF*10**-6/IS);#V\n",
"R5=(VCC-VBE-VBE-VEE)/(IREF*10**-6);#ohm\n",
"R5=round(R5/1000);#kohm\n",
"print \"Value of R5(kohm) : \",R5"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Estimated input reference current , IREF(micro A) 220.51\n",
"More precise value of reference current , IREF(micro A) 225.88\n",
"Value of R5(kohm) : 12.0\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.2:Pg-81"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 2.2\n",
"import math\n",
"# data from fig of Ex2.2\n",
"IC10=20*10**-6;#A\n",
"IREF=0.5*10**-3;#A\n",
"IS=10**-14;#A\n",
"VT=25*10**-3;#V(Thermal Voltage)\n",
"R4=VT/IC10*math.log(IREF/IC10);#ohm\n",
"print \"For Widlar current source design, the value of R4(kohm) : \",round(R4/1000,2)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"For Widlar current source design, the value of R4(kohm) : 4.02\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.3:Pg-82"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 2.3\n",
"\n",
"import math\n",
"# given data\n",
"Gm1=10.0;#mA/V\n",
"Gm1=Gm1/1000;#A/V\n",
"Cc=50.0;#pF\n",
"Cc=Cc*10**-12;#F\n",
"Rt=10**8;#ohm(Shunting resistance with Cc)\n",
" # solution\n",
"Ao=Gm1*Rt;#unitless\n",
"fp=1/(2*math.pi*Rt*Cc);#Hz\n",
"ft=Gm1/(2*math.pi*Cc)/10**6;#MHz\n",
"print \"Frequency at which gain is maximum, fp in Hz\",round(fp,1)\n",
"print \"Unit gain frequency, ft(MHz)\",round(ft,1)\n",
"#Bode plot can not be plotted with the given data in the question by using python functions. \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Frequency at which gain is maximum, fp in Hz 31.8\n",
"Unit gain frequency, ft(MHz) 31.8\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.4:Pg-83"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 2.4\n",
"\n",
"import math\n",
"# given data\n",
"SR=10.0/10**-6;#V/s\n",
"Vout=10.0;#V(magnitude of output voltage)\n",
"fm=SR/(2*math.pi*Vout)/1000;#kHz\n",
"print \"Full power bandwidth(kHz)\",round(fm,1)\n",
"VT=25.0/1000;#V(Thermal voltage)\n",
"ft=SR/(2*math.pi*4*VT)/10.0**6;#MHz\n",
"print \"Unity gain bandwidth(MHz)\",round(ft,1)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Full power bandwidth(kHz) 159.2\n",
"Unity gain bandwidth(MHz) 15.9\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.5:Pg-84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Ex 2.5\n",
"\n",
"VCC=5;#V\n",
"VEE=-5;#V\n",
"VBE=0.6;#V\n",
"VCE23=0.6;#V\n",
"VCE_sat=0.2;#V\n",
"Vo_max=VCC-VCE_sat-VBE;#V\n",
"Vo_min=VEE+VCE_sat+VBE+VCE23;#V\n",
"print \"Maximum output voltage(V)\",round(Vo_max,2)\n",
"print \"Minimum output voltage(V)\",round(Vo_min,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum output voltage(V) 4.2\n",
"Minimum output voltage(V) -3.6\n"
]
}
],
"prompt_number": 11
}
],
"metadata": {}
}
]
}