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{
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"name": "",
"signature": "sha256:cd13dfdb6dd7420874a1c992512f922297a6fa769a755d9c2c04bb32f02bdf3a"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 7: Radio Transmitters and Receivers "
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1, page no. 153"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"# Variable Declaration\n",
"fs1 = 1.00*pow(10,6) # Sampling Frequency (Hz)\n",
"fs2 = 25.00*pow(10,6) # Sampling Frequency (Hz)\n",
"fi = 455.00*pow(10,3) # Intermediate Frequency (Hz)\n",
"Q = 100.00 # Loaded Q of the antenna coupling circuit \n",
"\n",
"# Calculation\n",
"import math # Math Library\n",
"fsi1 = fs1+2*fi # Image Frequency (Hz)\n",
"rho1 = fsi1/fs1-fs1/fsi1 # Constant 1\n",
"alpha1 = math.sqrt(1+pow(Q*rho1,2)) # Rejection Ratio 1\n",
"fsi2 = fs2+2*fi # Image Frequency (Hz) \n",
"rho2 = fsi2/fs2-fs2/fsi2 # Constant 2\n",
"alpha2 = math.sqrt(1+pow(Q*rho2,2)) # Rejection Ratio 2\n",
"\n",
"# Result\n",
"print \"(a) Image Frequency, fsi =\",fsi1/pow(10,3),\"kHz\"\n",
"print \" rho =\",round(rho1,3)\n",
"print \" Image Rejection, Alpha =\",round(alpha1,1)\n",
"print \"(b) Image Frequency, fsi =\",fsi2/pow(10,6),\"MHz\"\n",
"print \" rho =\",round(rho2,4)\n",
"print \" Image Rejection, Alpha =\",round(alpha2,2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) Image Frequency, fsi = 1910.0 kHz\n",
" rho = 1.386\n",
" Image Rejection, Alpha = 138.6\n",
"(b) Image Frequency, fsi = 25.91 MHz\n",
" rho = 0.0715\n",
" Image Rejection, Alpha = 7.22\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2, page no. 153"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"# Variable Declaration\n",
"alpha1 = 138.6 # Image Rejection From Example 7.1\n",
"alpha2 = 7.22 # Image Rejection From Example 7.1\n",
"rho = 0.0715 # Constant From Example 7.1\n",
"Q = 100.00 # Loaded Q From Example 7.1\n",
"fsi_dash = 1.91*pow(10,6) # Image Frequency (Hz)\n",
"fs_dash = 1.00*pow(10,6) # Sampling Frequency 1 (Hz)\n",
"fs = 25.00*pow(10,6) # Sampling Frequency 2 (Hz)\n",
"\n",
"\n",
"# Calculation\n",
"import math # Math Library\n",
"Q_dash = math.sqrt(pow(alpha1/alpha2,2)-1)/rho # Loaded Q of the RF amplifier\n",
"fi_dash = (fsi_dash/fs_dash*fs-fs)/2 # Intermediate Frequency (Hz) \n",
"\n",
"# Result\n",
"print \"(a) The Q of the circuit is\",round(math.sqrt(Q*Q_dash)),\", which is the geometric mean of\",round(Q),\"and\",round(Q_dash)\n",
"print \"(b) Intermediate Frequency, fi_dash =\",round(fi_dash/pow(10,6),1),\"MHz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) The Q of the circuit is 164.0 , which is the geometric mean of 100.0 and 268.0\n",
"(b) Intermediate Frequency, fi_dash = 11.4 MHz\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3, page no. 164"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"# Variable Declaration\n",
"R1 = 110.00*pow(10,3) # RESISTANCE 1 (Ohms)\n",
"R2 = 220.00*pow(10,3) # RESISTANCE 2 (Ohms)\n",
"R3 = 470.00*pow(10,3) # RESISTANCE 3 (Ohms)\n",
"R4 = 1.00*pow(10,6) # RESISTANCE 4 (Ohms)\n",
"\n",
"# Calculation\n",
"import math # Math Library\n",
"Rc = R1+R2 # Resistance (Ohm)\n",
"Zm = R2*R3*R4/(R2*R3+R3*R4+R2*R4)+R1 # Impedance (Ohm)\n",
"m_max = Zm/Rc # Maximum Modulation Index\n",
"\n",
"# Result\n",
"print \"Maximum Modulation Index, m_max =\",round(m_max*pow(10,2)),\"%\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum Modulation Index, m_max = 73.0 %\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
