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1
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1answer
32 views

Loss of speed on error-free aDSL line [on hold]

Is there such a thing as an old telephone line? Does a POTS cable deteriorate over time? I am talking about lines in area where no one lived 75 years ago. Sometimes a customer using an asymmetric DSL ...
-2
votes
1answer
39 views

The bandwidth Ω of a low-pass signal f(t) ↔ F(ω)

I'm not sure about the answers to the two parts of this question: The bandwidth Ω of a low-pass signal f(t) ↔ F(ω) is defined by the constraint: $$ \frac{1}{2\pi } \int_{- \Omega }^{\Omega } ...
1
vote
1answer
46 views

finding out the bandwidth of m(t)*m(t) if the bandwidth of m(t) is a known quantity

m(t)*m(t) in time domain is equivalent to the convolution of m(w) and m(w) in frequency domain.Thus if the bandwidth of m(t) is a known quantity then how is the bandwidth of m(t)*m(t) is determined?
3
votes
2answers
118 views

RF Narrow bandpass filter (crystal ladder)

I am currently designing a narrow band pass filter at around 8Mhz, using the crystals having a resonance frequency of 8Mhz. Using the tutorial from ...
0
votes
0answers
29 views

Optimizing a data link

I am running into trouble trying to optimize a VSAT running at 4096kb/s QPSK modulation. I've found that using a more advanced modulation scheme permits more bits per baud to be transmitted. But ...
0
votes
2answers
56 views

Choosing Oscilloscope with appropriate bandwidth for Jitter analysis

Can someone give me a rule of thumb of choosing Oscilloscope with appropriate bandwidth for the Jitter analysis of clock signals? What device is highly preferable: spectrum analyzers, frequency ...
0
votes
1answer
70 views

Application and uses of particular band pass filters

What are the uses of active inverting band pass filters? Also what are the uses of an infinite gain multiple feedback active band pass filter? Circuits on here: ...
3
votes
5answers
271 views

Does the fundamental frequency affect the bit rate on a wire?

This is from the book Computer Networks by Tennenbaum: The bandwidth is still the width of the band of frequencies that are passed, and the information that can be carried depends only on this ...
1
vote
0answers
72 views

Why more bandwidth means more bit rate per second? [duplicate]

According to this link ( and some other sources I have found ) more bandwidth on a wire means more bit rates per second... Can someone try to explain why this is so as simple as possible? This is ...
0
votes
1answer
117 views

closed loop gain and bandwith calculation

For school I have to solve this schematic (For connection 7), but I have no idea how to do this. They ask me to calculate the bandwith and the Closedloop gain in dB. Edit: High Resolution Image
2
votes
3answers
274 views

Does an Oscilloscope's bandwidth need to match or exceed the microcontroller's/processor's clock speed?

Looking to buy an oscilloscope for home use, I've seen the questions on here in regards to bandwidth. I'm interested in prototyping microprocessors with clock speeds 800+ MHz, but I shouldn't need an ...
0
votes
1answer
119 views

Problem with TDA2050_single_application_Circuit

I have many problems with TDA 2050. Why TDA2050 use high-pass filters? What is the bandwidth of it? Does the range of bandwidth is from the range of frequencies below the human hearing?(20-20KHz) I ...
0
votes
2answers
90 views

What is the bandwidth of an imaginary convolution?

I am trying to figure out the bandwidth of \$f_1f_2\$, where \$f_1 = sinc^2(3t)\$ and \$f_2 = sin(100t)\$. So when I take the Fourier Transform, I can rewrite the equation as such: \$F(\omega) ...
0
votes
1answer
86 views

Parallel resonant circuit problem

Before I start, YES this is for homework so I dont expect a full answer. Just a pointer to the right method would be helpful. I have a parallel resonant circuit. My known value is the value of the ...
2
votes
1answer
179 views

Theoretical break frequency and bandwidth of notch filter

I'm trying to learn how to calculate the bandwidth and break frequency for the notch filter shown below. I was told that wye-delta and delta-wye transformation would be needed, but don't fully ...
2
votes
3answers
274 views

Why do higher frequencies mean higher data rates, and why do we even need frequencies to begin with?

This is regarding wired connections. I have heard that higher frequencies mean higher data rates since there are more cycles per second you can fit more data in per second. That makes sense but I ...
6
votes
1answer
294 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
155 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
64 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
5answers
168 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
49 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 ...
4
votes
1answer
369 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
1k 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
104 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
1k 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
743 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
136 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
378 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
86 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
475 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
821 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
193 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
432 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
1k 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
392 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
314 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
622 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 ...
11
votes
4answers
3k 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
272 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
431 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 ...
0
votes
1answer
242 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 ...
19
votes
2answers
2k 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
394 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
739 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
2k 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
280 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 ...
4
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
160 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
69 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 ...
12
votes
3answers
5k 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 ...