Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 2, Problem 31P
What is the voltage reading of the meter in Figure 2-65?
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4. A battery operated sensor transmits to a receiver that is plugged in to a power outlet. The device is
continuously operated. The battery is a 3.6 V coin-cell battery with a 245mAHr capacity.
The application requires a bit rate of 36 Mbps and an error rate of less than 10^-3. The channel has a
center frequency of 2.4 GHz, a bandwidth of 10 MHz and a noise power spectral density of 10^-14
W/Hz. The maximum distance is 36 meters and the losses in the channel attenuates the signal by 0.25
dB/meter.
Your company has two families of chips that you can use. An M-ary ASK and an M-ary QAM chip. The
have very different power requirements as shown in the table below.
The total current for the system is the current required to achieve the desired Eb/No PLUS the current
identified below:
Hokies PSK Chip Set Operating Current NOT Including
the required Eb/No for the application
Hokies QAM Chip Set Operating Current NOT Including
the required Eb/No for the application
Chip ID
M-ary
Voltage (volts)…
Using the 802.11a specifications given below, in Matlab (or similar tool) create the time domain signal
for one OFDM symbol using QPSK modulation. See attached plot for the QPSK constellation.
Your results should include the power measure in the time and frequency domain and comment on
those results.
BW
802.11a OFDM PHY Parameters
20 MHZ
OBW
Subcarrer Spacing
Information Rate
Modulation
Coding Rate
Total Subcarriers
Data Subcarriers
Pilot Subcarriers
DC Subcarrier
16.6 MHZ
312.5 Khz (20MHz/64 Pt FFT)
6/9/12/18/24/36/48/54 Mbits/s
BPSK, QPSK, 16QAM, 64QAM
1/2, 2/3, 3/4
52 (Freq Index -26 to +26)
48
4 (-21, -7, +7, +21)
*Always BPSK
Null (0 subcarrier)
52 subarriers
-7
(48 Data, 4 Pilot (BPSK), 1 Null)
-26 -21
0
7
21 +26
14
One Subcarrier
1 OFDM symbol
1 OFDM Burst
-OBW 16.6 MHz
BW 20 MHZ
1 constellation point
= 52 subcarriers
= one or more OFDM symbols
802.11a OFDM Physical Parameters
Show signal at this point
x bits
do
Serial
Data
d₁
S₁
Serial-to-
Input
Signal
Parallel
Converter
IFFT…
Find Vb and Va using Mesh analysis
Chapter 2 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 2 - The number of neutrons in the nucleus is the...Ch. 2 - The unit of charge is the ampere.Ch. 2 - Energy in a battery is stored in the form of...Ch. 2 - Prob. 4TFQCh. 2 - In a five-band precision resistor, the fourth band...Ch. 2 - A rheostat performs the same function as a...Ch. 2 - A strain gauge changes resistance in response to...Ch. 2 - Prob. 8TFQCh. 2 - Prob. 9TFQCh. 2 - The three basic measurements that can be done by a...
Ch. 2 - A neutral atom with an atomic number of three has...Ch. 2 - Electron orbits are called shells nuclei waves...Ch. 2 - Materials in which current cannot be established...Ch. 2 - When placed close together, a positively charged...Ch. 2 - The charge on a single electron is 6.2510-18C...Ch. 2 - Prob. 6STCh. 2 - Prob. 7STCh. 2 - Prob. 8STCh. 2 - Prob. 9STCh. 2 - Prob. 10STCh. 2 - Prob. 11STCh. 2 - There is no current in a circuit when a series...Ch. 2 - Prob. 13STCh. 2 - Potentiometers and rheostats are types of voltage...Ch. 2 - The current in a given circuit is not to exceed 22...Ch. 2 - How many coulombs of charge do 501031 electrons...Ch. 2 - How many electrons does it take to make 80C of...Ch. 2 - What is the charge in coulombs of the nucleus of a...Ch. 2 - What is the charge in coulombs of the nucleus of a...Ch. 2 - Detemine the voltage in each of the following...Ch. 2 - Five hundred joules of energy are used to move 100...Ch. 2 - What is the voltage of a battery that uses 800 J...Ch. 2 - How much energy does a 12 V battery in your car...Ch. 2 - Assume that a solar battery charger delivers 2.5 J...Ch. 2 - If the solar cell in Problem 9 has moved the...Ch. 2 - Determine the current in each of the following...Ch. 2 - Six-tenths coulomb passes a point in 3 s. What is...Ch. 2 - How long does it take 10 C to flow past a point if...Ch. 2 - How many coulombs pass a point in 0.1 s when the...Ch. 2 - Figure 2-61(a) shows color-coded resistors....Ch. 2 - 16. Find the minimum and the maximum resistance...Ch. 2 - If you need a 270 resistor with 5% tolerance. what...Ch. 2 - Determine the resistance value and tolerance for...Ch. 2 - Determine the resitance and tolerance of each of...Ch. 2 - Determine the color bands for each of the...Ch. 2 - Determine the resistance and tolerance of each of...Ch. 2 - Determine the color bands for each of the...Ch. 2 - Determine the resistance values represented by the...Ch. 2 - The adjustable contact of a linear potentlometer...Ch. 2 - Trace the current path in the lamp circuit of...Ch. 2 - With the switch in either position, redraw the...Ch. 2 - Show the placement of an ammeter and a voltmeter...Ch. 2 - Show how you would measure the resistance of R2 in...Ch. 2 - In Figure 2-64 what does each voltmeter indicate...Ch. 2 - In Figure 2-64, show how to connect an ammeter to...Ch. 2 - What is the voltage reading of the meter in Figure...Ch. 2 - How much resistance is the meter in Figure 2-66...Ch. 2 - Determine the resistance indicated by each of the...Ch. 2 - A multimeter has the following ranges:...Ch. 2 - A resistor with a current of 2 A through it in an...Ch. 2 - If 5741015 electrons flow through a speaker wire...Ch. 2 - A 120 V source is to be connected to a 1500...Ch. 2 - Determine the resistance and tolerance of each...Ch. 2 - Prob. 39PCh. 2 - Through which resistor in Figure 2-70 is there...Ch. 2 - In Figure 2-70, show the proper placement of...Ch. 2 - Show the proper placement of voltmeters to measure...Ch. 2 - Devise a switch arrangement where by two voltage...
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