Questions tagged [bandwidth]
Related to signal processing (a measure of the width of a range of frequencies, measured in hertz) or the rate of data transfer(or throughput) measured in bits per second
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questions
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What is transmission bandwidth?
I am taking Keysight "Signal Generation and Digital Modulation" webinar. In the slide below, under transmission bandwidth required graph, there is formula of 2/T. What do this graph and ...
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67 views
Why do digital signals require more bandwidth compared to analog signals? [closed]
I have read this many times but haven't seen a clear explanation for it anywhere. How can this be understood with an example?
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Bandwidth of a pulse code modulation system
Original test question:
24 telephone channels, each bandlimited to 3.4kHz are to be time division multiplexed by using pulse code modulation. Calculate the bandwidth of pulse code modulation system ...
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2answers
77 views
Bandwidth of a signal
I have found that the convolution of two rect(f) functions (f=frequency) gives a triangular pulse of width 2 centred at 0 Hz. Can anyone tell me what the bandwidth of this pulse is? Is it F or 2F?
My ...
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3answers
71 views
Ethernet Surge Protector Speed
I've been investing in some new surge protectors lately – a fraught process at best given the difficulties of comparing model and brand quality. Things were even trickier when looking into ethernet (...
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1answer
99 views
When these prototype devices become commercialised/productionised, how is the signal processing aspect of the oscilloscope built in to the device? [closed]
I read a lot of research papers that use large and expensive equipment, such as oscilloscopes, to do their signal processing. Oscilloscopes offer high sampling rate and bandwidth, which makes them ...
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5answers
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How am I getting 1 Gbps through a CAT3 cable?
My work from home office, in a difficult-to-plumb part of my house, has an existing CAT3 running to it from the main part of the house. I wanted to use a wired connection because the Wifi flakes out ...
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2answers
113 views
Building a band-pass filter using an op-amp
I am quite new to op-amps but have looked at them in college and have done my own research on them. I am trying to use an op-amp to build a simple band-pass filter which has an in-band voltage gain of ...
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2answers
182 views
Op-Amp Speed: Bandwidth vs Slew Rate
I was learning about the difference between op-amp slew rate and bandwidth.
Everywhere it says slew rate is a large signal parameter and BW is a small signal parameter.
I have few questions:
What you ...
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2answers
681 views
Maximum Ethernet bandwidth through a slip ring
I'm trying to understand what would prevent a 1 GbE non-optical slip-ring from transmitting 10GbE, 40GbE or even 100/200/400GbE. They all have 'metallic'/copper variants (backplane or short cable) and ...
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5answers
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Was the last mile copper wire not the limitation in dial-up internet service?
My local internet service providers can provide ADSL (asymmetric digital subscriber line) service at various speeds, for example, 50 M bits per second. This service is in Canada.
Is this typically ...
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2answers
61 views
Can an ADXL327 accelerometer be used with theoretically unlimited bandwidth?
I saw several studies that use the 3-axis ADXL327 accelerometer, 0.1-3000 Hz band-pass filtered and sampled at 20KHz based on previous studies that showed that the signals of interest have frequencies ...
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785 views
Is -3dB bandwidth defined for any type of transfer function?
If I have response like the following, is it still valid to say bandwidth of the circuit is 2.31kHz?
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1answer
110 views
Add negative feedback to this 2-stage amplifier
I am designing this 350mW 2-stage amplifier. The amplifier has only a voltage amplification stage Q2 biased with a current source Q1+Q3, a buffer Q6 and an output stage Q4+Q5. The input will be an ...
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21 views
5G NR and OFDM modulation with IFFT
I'm studying 5G NR and to understand better how it works I'm trying to implement it in Simulink using the built-in OFDM block.
From what I've understood, the numerology in 5G basically set the ...
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2answers
76 views
What is the purpose of negative frequencies? [duplicate]
Below you can see the frequency spectrum of a square pulse. But what exactly is the purpose of the negative frequencies?
Lets say I have a square pulse with a width of 10ns (f=100MHz) and I want to ...
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28 views
Determining sample rate / bandwidth for a gyroscope with no ODR setting
My understanding is that a sensor's bandwidth should be half it's ODR (the rate at which you sample data). I am working with the BNO055 sensor and trying to get angular velocity from it, which will be ...
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29 views
Which is the bandwidth of an analog PAM (needed to design an amplifier)?
in a university test, I've been asked to design an amplifier for the following signal:
$$s(t)=\left[\sum_{i=1}^{\infty}rect\left(\frac{t-t_i}{T}\right)\right]\cdot Acos\left(2\pi f_0t+\varphi\right)$$
...
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How would you get the bandwidth of a MIMO system
I found online that:
(SKOGESTAD; POSTLETHWAITE, 2005, p. 81) bandwidth of a MIMO system is the frequency where the maximum singular value of the sensitivity function matrix crosses 0.707 (-3 dB) from ...
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4answers
256 views
Finding the bandwidth of second order lowpass filter
I have a lowpass filter with the transfer function \$H(s) = -\frac{3}{3s^2+s+3} \$. Converting it to standard form yields
$$H(s) = -\frac{1}{s^2+\frac{1}{3}s+1} $$
Comparing this to the standard ...
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1answer
29 views
Quality factor multiple definitions
On studying RLC circuits, I have come across two definitions of Q factor. One is obviously the measure of selectivity and goes as this:
The other is this:
Is there any link between these 2 ...
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1answer
141 views
How to calculate the bandwidth of a synchronous bus with overlap in bus transfer and reading next data?
I am working through problems in Saylor Academy's computer architecture course. I can't understand how this kind of problem is solved:
Consider a 32-bit synchronous bus with f = 125 Mhz, an 8 nsec ...
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1answer
111 views
How to find the bandwidth of a function having infinite DC gain?
The transfer function of a plant is given by \$G(s) = \frac {10}{s(s+15)} \$.
After plotting the Bode Plot on Matlab, I can't find the bandwidth of this system since it has infinite DC gain.
Could ...
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1answer
41 views
How to find the relative bandwidth /frequency of a aperiodic signal?
I have a transfer function with a fixed cut off frequency and I wanted to apply an input proportional to time(x= cont*time), also the condition is to have a frequency greater than the cut off ...
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3answers
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Why are common mode chokes with 90 ohm @ 100 MHz recommended for USB 2.0 Hi-Speed data lines?
When one looks at common mode chokes for USB 2.0 applications choke manufacturers always recommend CMC with a common mode impedance of 90 ohms @ 100 MHz.
Example
How does this relate to
USB 2.0 ...
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908 views
Why do we have a limited bandwidth in electronics?
I've been looking around a bit on optical communications and it is said that the main advantage in using optical communications, namely optical fibers, lies in the gigantic bandwidth available, when ...
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0answers
72 views
Need help understanding RF radio parameters
I am experimenting with the SPSGRF-915 RF transceiver, particularly with the different center frequencies.
My question mainly revolves around the situation where multiple devices can transmit at the ...
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1answer
34 views
Could the OCTC(open circuit time constant) method estimate the current gain bandwidth?
I have already know the OCTC and SCTC method could estimate the cut-off frequency of the voltage gain. Are there any method to estimate the cut-off frequency of the current gain?
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LoRa CSS modulation chip rate and bandwidth
In this question, as well as in many other detailed explanations of how LoRa CSS modulation works, each analysis starts by saying that the chip rate, Rc, is equal to the bandwidth BW. Why is that?
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141 views
What is the derivation for Shannon Hartley theorem?
I know by Hartley's theorem that information is proportional to bandwidth and time. The capacity corresponds to information and bandwidth is there. I don't get how the logarithmic part corresponds to ...
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1answer
49 views
What is the derivation for shot noise current?
The screenshot is taken from
Principles of Electronic Communications
by Louis E. Frenzel Jr.
I don't know where the formula came from and I tried searching, but couldn't seem to find any that I ...
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37 views
Spectral properties of QPSK modulation
From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad spectrum, well ...
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42 views
Is bandwidth of cmos comparator important?
The concept of bandwidth is developed based on small-signal analysis. However, comparator works usually under large-signal conditions, and transistors are not in saturation region, since comparator ...
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2answers
95 views
Why does higher bitrate requires higher bandwith?
I try to understand this question since a while and I think I came to an understanding. But I need someone to confirm it.
At first, I thought the bitrate was dependent on the frequency (more sines per ...
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36 views
I am wondering about the relative between Step input and bandwidth
How we can do define the explanation of bandwidth in step input graph?
Sorry to not explain about problem deeply, cuz I am newbie about control theory.
in book , that explaining smaller 3dB of when ...
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3answers
75 views
Definition of signal bandwidth
From my understanding the bandwidth of an input signal to an ADC is defined as the range of frequencies the signal consists of, which is calculated as the difference between the highest and lowest ...
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1answer
112 views
Op amp advertised as BW = 105MHz, but GBP is actually 70MHz, what's being spec'd differently?
I just came about an op-amp spec where they say, "the Op-amp X is unity-gain stable with a small-signal unity gain bandwidth of 105MHz.." As you continue to read, it then says, "with a ...
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2answers
69 views
Does the bandwidth at the receiver really affects the noise in digital modulations?
I know that, in a telecommunicacion system, the AWGN power after going through the receiver filter is
$$
P_z = KTB
$$
where B is the bandwidth of the filter, T is the operating temperature of the ...
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9answers
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If a square wave has infinite bandwidth, how can we see it on an oscilloscope?
If a square wave requires infinite bandwidth how can we display it on oscilloscopes?
Link: Oscilloscope fundamentals.
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1answer
66 views
Generating a short needle pulse
I have an op-amp with a 100 MHz bandwidth. The input of this o-pamp will be a 65 MHz square wave. Can I expect to get something like a needle looking pulse? Because I am only going to have the first ...
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52 views
Two amplifiers in cascade
I want to do a simulation with two type amplifiers (PA107DP) in cascade to expand the bandwidth.
How can I do ? just I connect the output of first to the input of second (out-one I connect it to -IN ...
0
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2answers
97 views
Bandwidth vs slew rate
I have some difficulties in understanding the difference between bandwidth and slew rate.
I got that we are talking about large or small signal but what if for example the input signal is a PWM one ...
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41 views
RC noise figure calculation
I would ask for some help with noise figure calculation for circuit attached. It is front end of improvised differential probe that I would like to build. I am aware that simulators such as LTSpice ...
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Solving PLL Loop BW Transfer Function
𝑍(𝑠)= (1+𝑠.𝐶2.𝑅2)/(𝑠.(𝐴3.𝑠^3+𝐴2.𝑠^2+𝐴1.𝑠+𝐴0)
C2 = 0.0000001F
R2 = 1000 Ohm
A0 = 0.000000106034
A1 = 1.27859848E-12
A2 = 4.5011166848E-18
A3 = 4.31278848E-24
G(𝑠)= (𝐾𝑝𝑑.𝐾𝑣𝑐𝑜.𝑍(𝑠...
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2answers
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Common emitter bandwidth and probing
I am trying to design a simple RF amplifier for a 1MHz AM signal (for low-power transmission). My modulator (JFET-based) outputs ~...
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5answers
159 views
Required GBW of an op-amp
So if my Vin signal is of 50kHz and I want a gain of 50, would this mean that the GBW of the op-amp has to be at least 2.5Mhz? What happens if its below 2.5Mhz
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why sometimes we need to use Broadband Transmission (Using Modulation)?
I was reading a textbook which says:
Baseband transmission requires that we have a low-pass channel, a channel with a bandwidth that starts from zero. This is the case if we have a dedicated medium(...
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0answers
61 views
Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?
Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
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0answers
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Reducing bandwidth of op amp to eliminate op amp parasitic oscillation
I am using few op amps to amplify a signal coming from a FGEN. My signal from FGEN is around 500Khz-7.5Mhz. Now regardless of the supply, even when the FGEN is disconnected and power the op amp using ...
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3answers
120 views
Why does a channel need to have bandwidth requirement for digital data transmission?
I'm not from EE background and try to understand how digital is sent in a channel as a non-technical audience.
Let's say we use fiber optics to transmit digital data 010101....,
Since fiber optics use ...