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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter7 Receivers"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.3.1,Pg.no.227"
]
},
{
"cell_type": "code",
"execution_count": 20,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The freq tuning range is 1005000 Hz to 2055000 Hz\n",
"The tuning range ratio of oscillator is 2 ohm\n",
"The capacitor tuning range ratio of oscillator is 4\n",
"The tuning range ratio of RF−ckt is 2\n",
"The capacitor tuning range ratio of RF−ckt is 4\n"
]
}
],
"source": [
"import math\n",
"fs_min=550*10**3\n",
"fs_max=1600*10**3\n",
"IF=455*10**3 \n",
"#Determination of freq tuning ranges\n",
"fo_min=fs_min+IF\n",
"fo_max=fs_max+IF\n",
"print 'The freq tuning range is',fo_min,'Hz to',fo_max,'Hz'\n",
"Rf=(fo_max)/(fo_min) #calculation of freq tuning range ratio\n",
"print 'The tuning range ratio of oscillator is',Rf,'ohm'\n",
"Rc=Rf**2 #calculation of capacitance tuning range ratio\n",
"print 'The capacitor tuning range ratio of oscillator is',Rc\n",
"#For RF section\n",
"Rf1=fs_max/fs_min;\n",
"print 'The tuning range ratio of RF−ckt is',Rf1\n",
"Rc1=Rf1**2\n",
"print 'The capacitor tuning range ratio of RF−ckt is',Rc1"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.4.1,Pg.no.230"
]
},
{
"cell_type": "code",
"execution_count": 21,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The Cs min is 84.0 *10^-12 F\n"
]
}
],
"source": [
"import math\n",
"Rco=8.463\n",
"Rfo=2.909\n",
"Rcs=4.182\n",
"Rfo=2.045\n",
"fo_max =2055.0*10**3\n",
"fo_min=1005.0*10**3\n",
"Cs_max=350.0\n",
"#For the RF section\n",
"Cs_min=Cs_max/Rcs\n",
"Cs_min=round(Cs_min,0)\n",
"print 'The Cs min is',Cs_min,'*10^-12','F'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.6.1,Pg.no.234"
]
},
{
"cell_type": "code",
"execution_count": 22,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Image freq is 1930.0 Hz\n",
"Image rejection is -36.98\n"
]
}
],
"source": [
"import math\n",
"from math import sqrt\n",
"IF=465.0 #IF in KHz\n",
"fs=1000 #Tuning freq in KHz\n",
"Q=50.0 #Quality factor\n",
"#Oscillator freq fo is given as\n",
"fo=fs+IF;\n",
"#a) Image freq is given as\n",
"fi=fo+IF\n",
"print 'Image freq is',fi,'Hz'\n",
"y=fi/fs-fs/fi\n",
"#b) image rejection is given as\n",
"Ar=1/sqrt(1+(y*Q)**2)\n",
"Ar_dB=20*math.log10(Ar)\n",
"Ar_dB=round(Ar_dB,2)\n",
"print 'Image rejection is',Ar_dB"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 7.7.1,Pg.no.236"
]
},
{
"cell_type": "code",
"execution_count": 34,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The sum of frequencies are\n",
"1860\n",
"The difference of frequencies are\n",
"950\n"
]
}
],
"source": [
"import math\n",
"fs=950 #in KHz\n",
"IF=455 #in KHz\n",
"m=[1,2]\n",
"n=[1,2]\n",
"f0=fs+IF\n",
"print 'The sum of frequencies are'\n",
"for i in range (1,2):\n",
" for j in range (1,2):\n",
" fu1=j/i *f0 + 1/i*IF\n",
" print fu1\n",
"print 'The difference of frequencies are'\n",
"for i in range (1,2):\n",
" for j in range (1,2):\n",
" fu2=j/i*f0 - 1/i*IF\n",
" print fu2"
]
}
],
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