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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 10 - Negative Feedback Amplifiers"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## PageNumber 467 example 1"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"reverse transmission = 0.10\n",
"gain with feedback = 10.00\n"
]
}
],
"source": [
"from __future__ import division\n",
"av=1000#\n",
"chvoga=0.001##change in voltage gain\n",
"beta1=1/((chvoga)/(100/av))-1#\n",
"beta1=beta1/av#\n",
"fegain=(av)/(1+(av*(beta1)))#\n",
"print \"reverse transmission = %0.2f\"%((beta1))\n",
"print \"gain with feedback = %0.2f\"%((fegain))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## PageNumber 467 example 2"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"output voltage = 2.19\n",
"input voltage = 0.25 volt\n"
]
}
],
"source": [
"voltag=36##volt\n",
"w=0.07##harmonic distortion\n",
"inpvol=0.028##volt\n",
"beta1=0.012#\n",
"a=voltag/inpvol#\n",
"fegain=a/(1+beta1*a)##correction in book\n",
"volta1=fegain*inpvol#\n",
"print \"output voltage = %0.2f\"%((volta1))\n",
"#decrease of gain 9\n",
"inpvol=9*inpvol#\n",
"print \"input voltage = %0.2f\"%((inpvol)),\"volt\"#"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## PageNumber 468 example 3"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"required input = 1.00 volt\n",
"harmonic distortion = 0.10\n"
]
}
],
"source": [
"from __future__ import division\n",
"volgain=2000##voltage gain\n",
"outpower=20##watts\n",
"inpsig=10*10**-3##volts\n",
"fedbac=40##decibel\n",
"fedgai=volgain/100#\n",
"outvol=volgain*inpsig##output voltage\n",
"inpvol=outvol/fedgai##required input\n",
"#10 second harmonic distortion\n",
"distor=(10/100)#\n",
"print \"required input = %0.2f\"%((inpvol)),\"volt\"#\n",
"print \"harmonic distortion = %0.2f\"%((distor))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## PageNumber 469 example 5"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"feedback factor = 0.019\n",
"over gain = 0.005\n"
]
}
],
"source": [
"from __future__ import division\n",
"fedgai=60##decibel\n",
"outimp=10*10**3##ohm\n",
"outim1=500##ohm modified impedance\n",
"fedgai=1000#\n",
"fedbac=((outimp/outim1)-(1))/fedgai#\n",
"#10 change in gain\n",
"overga=1/((1+(fedgai*fedbac))/0.1)##over gain\n",
"print \"feedback factor = %0.3f\"%((fedbac))\n",
"print \"over gain = %0.3f\"%((overga))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## PageNumber 470 example 6"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"current gain = -11.60\n",
"voltage gain = -46.40\n",
"transconductance = -0.01 ampere per volt\n",
"transresistance = -46403.71 ohm\n",
"input resistance = 1042.65 ohm\n",
"output resistance = 3636.36 ohm\n"
]
}
],
"source": [
"colres=4*10**3##ohm\n",
"r=4*10**3##ohm\n",
"basres=20*10**3##ohm\n",
"r1=1*10**3##ohm\n",
"hie=1.1*10**3#\n",
"hfe=50#\n",
"hoe=(40*10**3)#\n",
"ri=basres*hie/(basres+hie)#\n",
"curgai=((r1/(r1+ri)))*((basres/(basres+hie)))*((-hfe*colres)/(colres+r))#\n",
"volgai=curgai*r/r1#\n",
"tranco=volgai/r#\n",
"tranre=r1*volgai#\n",
"outres=hoe*colres/(hoe+colres)#\n",
"print \"current gain = %0.2f\"%((curgai))\n",
"print \"voltage gain = %0.2f\"%((volgai))\n",
"print \"transconductance = %0.2f\"%((tranco)),\"ampere per volt\"#\n",
"print \"transresistance = %0.2f\"%((tranre)),\"ohm\"#\n",
"print \"input resistance = %0.2f\"%((ri)),\"ohm\"#\n",
"print \"output resistance = %0.2f\"%((outres)),\"ohm\"#"
]
}
],
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|
