The bandwidth tag has no wiki summary.
6
votes
1answer
59 views
How does a zero in transfer function affect the bandwidth of a system
Suppose we have a system with the closed-loop gain:
\$\displaystyle G(s) = \frac{\omega_n^2}{s^2 + 2\zeta\omega_n+\omega_n^2}\$
Which is the default two-pole system closed-loop gain. Let's also ...
4
votes
1answer
107 views
What ultimately determines the speed of electrical media
I have heard several myths about this. Some have said "thicker wires mean faster speed" which I don't believe. Others have said different voltages and others have said higher frequencies.
Take Coax ...
0
votes
1answer
57 views
any way to boost data transmission in GPIB?
I have a pretty old device connected to computer with GPIB (IEEE 488 standard), the bandwidth is limited so it is pretty slow to transmission 1MB data. I wonder if it is possible to boost the ...
4
votes
6answers
118 views
What decides the range of FM band?
I read that the frequencies over which FM signals can be transmitted is limited between 88 MHz and 108 MHz. Why is it confined to a particular range and why specifically to this (88 MHz to 108 MHz) ...
1
vote
1answer
38 views
Calculate balance between signal and noise to allow 32 kbit/s transfer
I have to calculate proper balance/ratio between signal and noise ( S/N ) in decibels ( dB ), to be able to transfer data over the channel at 32 kbit/s. Channels bandwidth is 100 kHz.
I was given ...
3
votes
1answer
129 views
Is this measured rise time inaccurate because of limited oscilloscope bandwidth?
I don't have an LCR meter and wanted to learn how to use a fast edge pulse generator and an oscilloscope to do capacitance measurements as an academic exercise.
In W2AEW's videos, he builds a simple ...
0
votes
4answers
58 views
How to find lower 3dB and upper 3dB from PSPICE frequency response
I have simulated the frequency response of an amplifier circuit. Frequency range is from 10 Hz to 2.5 MHz. It gave me a plot with a y-axis range going from -50 to 50. I assume these are dBs but I am ...
1
vote
3answers
60 views
How do I decide the bandwidth of a driver through 'input transition rise and fall rate'?
I am carrying out a design with a driver:74LVC1G125 datasheet of 74LVC1G125. Signal that will go through this driver is about 600khz so I have to know the bandwaidth of 74LVC1G125. I have read the ...
1
vote
2answers
249 views
Closed loop bandwidth vs open loop bandwidth
Is closed loop bandwidth always greater than open loop bandwidth ?
If not on what factors does it depend ?
When can it be greater?
0
votes
1answer
296 views
What is the relationship between bandwidth and noise bandwidth
What is the mathematical formulae for noise bandwidth for a 1st order low pass system (and a second order LP systems analysis if possible). What is the importance of this concept, how and when is it ...
0
votes
1answer
58 views
estimate SNR improvement due to filter bandwidth of low pass filter
I facing a problem in GSM simulation. I am having a perfect GMSK modulated (I can assume that GMSK filter is 200kHz or 270 kHz band limited) signal in Tx path adding AWGN of 6dB SNR (Noise 6dB below ...
0
votes
3answers
184 views
what is meaning of infinite bandwidth of an amplifier
I have just learned about amplifier but the term infinite bandwidth confuses me a lot.plesse explain with some example.
0
votes
1answer
72 views
What determines how narrow a radio channel can be?
As an example: We used to have analog TV broadcast but now we're switched to digital. With digital we're able to pack in more data into a smaller frequency range. I assume that it is our advancements ...
2
votes
4answers
231 views
Nyquist theorem, seems wrong to me
For Nyquist theorem, for channels without noise the bit rate is:
\$N=2B\log_2(L)\$
N= bit rate, B= bandwidth, L= number of levels
Intuitively I say that it should be:
...
1
vote
2answers
261 views
Calculating maximum data rates
A channel has bandwidth 3 KHz, signal to noise ratio is 40 dB find maximum data rate for 16 level encoding schemes.
There are two ways to find channel capacity. First one is with Nyquist theorem and ...
1
vote
1answer
158 views
Why cable TV frequency range ends at 1 GHz?
Currently frequencies 50-1000 MHz are allocated for TV and data transfers. I understand why there are limitations for aerial or satellite transmissions, but why are they retained for cable ...
1
vote
2answers
190 views
Is this bandwidth calculation exactly correct?
Calculating bandwidth for a data bus is like the following in a text I read:
"The bus cycle speed is 200 MHz with 4 transmits of 64 bits per clock cycle. The bus bandwidth is then 200*4*64/8=800*64/8 ...
8
votes
3answers
847 views
How is rise time related to bandwidth of the signal?
Say, I want to limit the rise time of my digital signal edges to avoid dealing with transmission line effects.
How do I determine the maximum frequency of harmonics in my signal knowing that my rise ...
2
votes
2answers
317 views
Can a USB device have a low bandwidth because of poor connection?
I found in the garbage an old USB webcam with an OV 518 chip. The USB cable that was going out of it, however, wasn't there. There were just some remains of the tiny red/white/green/black wires that ...
5
votes
1answer
243 views
What limits the modulation of digital signals?
I am trying to understand why there are different speed on different frequency bands. I see that e.g. ZigBee can do 250kb/s for both 2.4GHz and 868/915MHz, but ...
8
votes
2answers
476 views
When would you need a low bandwidth opamp?
This opamp has a unity gain bandwidth of 27kHz, which is by far the lowest I've ever seen. (I first misread the 7.7V/ms slew rate as 7.7V/\$\mu\$s, because that's the units most often used.)
27kHz ...
10
votes
4answers
2k views
Is this a good design & layout of an active differential 'scope probe?
This question is an extension of Homebrew differential 'scope probe. I thought I should make this a new question though.
I need to measure a 100Mb/s LVDS signal to check its integrity. I will try to ...
-4
votes
1answer
249 views
High bandwith/ low latency wireless sensor network
I have a field of anywhere from 16 to 32 sensors that have to all transmit around 2Mbps simultaneously and continuously (I could possibly bring this down to around 1Mbps if it is the only way). The ...
1
vote
2answers
297 views
SINR versus transmission rate
In the following paper on applications of Game Theory to power control in communications,
http://mackenab.ece.vt.edu/wp-content/uploads/2011/06/mackenzie2001b.pdf
Why is the Signal to Interference ...
1
vote
1answer
195 views
Wideband Passband RF filter
I require a passband filter with
bandwidth of 500 MHz.
4 GHz central frequency.
minimize the attenuation of the signal (but there is no restriction on this as I am going to use power amplifiers ...
13
votes
1answer
1k views
Why are USB devices slower than 480 MBit/s
Motivation
With a signaling rate of 480 MBit/s USB 2.0 devices should be able to transmit data with up to 60 MB/s. However today's devices seem to be limited to 30-42 MB/s while reading [Wiki:USB]. ...
-3
votes
3answers
337 views
9bits/signal element, what's the bandwidth?
If I encode 9bits/signal element, what is the minimum required bandwidth of the channel in Hertz?
With the information that 9bits/signal element, is it possible to find its bit rate or any other ...
9
votes
1answer
524 views
Confused about frequency and bandwidth in BP filter?
I am trying to design a simple bandpass filter and I am confused what should be my central frequency and bandwidth should be.
I have a 1MHz square wave with 20% duty cycle, so the signal is on for ...
4
votes
1answer
1k views
Required Bandwidth for ASK
In Amplitude Shift Keying, the bandwidth required is given by \$B=(1+d)S\$ where B is bandwidth, S is the signal rate, and d is a value of either \$0\$ or \$1\$.
But how could the required bandwidth ...
2
votes
3answers
254 views
Where should an increase in harmonic frequencies go in the Nyquist formula?
From the Nyquist formula that \$ Capacity = 2 \times Bandwidth \times log_2(L) \$, where \$L\$ is the level the signal represents, the total number of possible bit combinations the signal can ...
2
votes
4answers
2k views
Why all digital signals have infinite bandwidth?
Why digital signals have "infinite bandwidth"? Frequency is the number of cycles per second. I have seen before the formula that bandwidth=Maximum Frequency - Minimum Frequency. I remember I was told ...
3
votes
1answer
144 views
Peaking Inductance
Could anyone please explain the working of so called 'peaking inductors'? I know they are used to enhance the bandwidth but how do they do this?
1
vote
1answer
64 views
How the bandwidth is impacted by the load?
The bandwidth of electronic parts, like analog switches, is usually specified for a specific load, typically 50 ohm and 5 pF for example.
Now if I have an analog switch with a bandwidth of 1 GHz for ...
11
votes
3answers
4k views
Oscilloscope Bandwidth, what's it all about?
This question popped up to me a few moments ago.
I was measuring what is intended to be a 50Mhz square wave of level 0 to 2.5, however what I saw on the screen is a sine wave that was centered around ...
