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"name": "",
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{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter02:Operational Amplifiers"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.1:pg-72"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Example 2.1 : Closed loop and open loop gain\n",
"# Consider inverting configuration\n",
"\n",
"# 2.1a\n",
"R_1=1000.0; # (ohm)\n",
"R_2=100*10.0**3; # (ohm)\n",
"A=10**3; # (V/V)\n",
"print A,\"= A (V/V)\"\n",
"G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
"print round(-G,2),\"= G\"\n",
"e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
"print round(e,2),\"= e (%)\"\n",
"v_1=0.1; # (V)\n",
"v_1=G*v_1/A;\n",
"print round(v_1*1000,2),\"= v_1 (mV)\"\n",
"A=10**4; # (V/V)\n",
"print A,\"= A (V/V)\"\n",
"G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
"print round(-G,2),\"= G\"\n",
"e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
"print round(e,2),\"= e (%)\"\n",
"v_1=0.1; # (V)\n",
"v_1=G*v_1/A;\n",
"print round(v_1*1000,3),\"= v_1 (mV)\"\n",
"A=10**5; # (V/V)\n",
"print A,\"= A (V/V)\"\n",
"G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
"print round(-G,2),\"= G\"\n",
"e=(-G-(R_2/R_1))/(R_2/R_1)*100;\n",
"print round(e,2),\"= e (%)\"\n",
"v_1=0.1; # (V)\n",
"v_1=G*v_1/A;\n",
"print round(v_1*1000,3),\"= v_1 (mV)\"\n",
"\n",
"# 2.1b\n",
"A=50000; # (V/V)\n",
"print A,\"= A (V/V)\"\n",
"G=-R_2/R_1/(1+(1+R_2/R_1)/A);\n",
"print round(-G,2),\"= G\"\n",
"print \"Thus a -50% change in the open loop gain results in only -0.1% in the closed loop gain\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1000 = A (V/V)\n",
"90.83 = G\n",
"-9.17 = e (%)\n",
"-9.08 = v_1 (mV)\n",
"10000 = A (V/V)\n",
"99.0 = G\n",
"-1.0 = e (%)\n",
"-0.99 = v_1 (mV)\n",
"100000 = A (V/V)\n",
"99.9 = G\n",
"-0.1 = e (%)\n",
"-0.1 = v_1 (mV)\n",
"50000 = A (V/V)\n",
"99.8 = G\n",
"Thus a -50% change in the open loop gain results in only -0.1% in the closed loop gain\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2.3:pg-88"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Example 2.3 : Design instrumentation amplifier\n",
"R_2=1-50000-1/1000.0+50;\n",
"print round(-R_2/1000.0,1),\"= R_2 (Kohm)\"\n",
"R_1=-2*R_2/999;\n",
"print round(R_1),\"= R_1 (ohm)\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"49.9 = R_2 (Kohm)\n",
"100.0 = R_1 (ohm)\n"
]
}
],
"prompt_number": 10
}
],
"metadata": {}
}
]
}
|
