The bandwidth tag has no wiki summary.
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3answers
132 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.
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1answer
70 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
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4answers
167 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
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2answers
142 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
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1answer
120 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
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2answers
130 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
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3answers
494 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
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1answer
237 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
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1answer
216 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 ...
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2answers
386 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
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4answers
1k 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
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1answer
232 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
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2answers
241 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 ...
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0answers
150 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 ...
12
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1answer
934 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
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3answers
299 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 ...
8
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1answer
298 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
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1answer
888 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
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3answers
244 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
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4answers
1k 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
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1answer
129 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
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1answer
60 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 ...
10
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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 ...
