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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Discrepancy in theoretical vs measured gainbandwidth in LTSPICE ideal OTA

I am using a very simple model to show the unity gainbandwidth of a closed loop sample and hold with a closed loop gain of 2. One would expect an ideal OTA to have a GBW independent of rout as GBW is ...
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Range Profile in Radar System

I am slightly confused on the range profile I am obtaining from my SCFW radar dataset. I am understanding of how fftshift works in shifting positive and negative frequency components to be centered ...
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Waveform acquired from scope, what is the sample rate for post processing?

I want to make a noise measurement with my scope, but I need it to be band-limited. I am using a Tektronix TBS1102, which allows me to save to a USB flash drive an Excel/CSV file with the X and Y ...
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JFET source follower input impedance without gate resistor

I am trying to do a high bandwith and high imput impedance analog front end for a mini oscilloscope project. I am using a JFET for this purpose. I accounter a weird behaviour and i don't understand it....
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Input signal bandwidth of ADC

I prepare to use adc to do sub-sampling. Most SAR adc has -3dB input signal bandwidth in datasheet but no for delta-signam adc. Can I use modulation frequency as the bandwidth or there is another way ...
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PCB and breadboard parasitic capacitance

I am getting different bandwidth measurements from my breadboard and PCB (for the same circuit with exact same component values). The cut-off frequency I measure on the breadboard is slightly higher ...
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Contradictory relationship between quality factor and damping

I am studying control theory and mechanical vibrations. From control theory aspect, I know that bandwidth and response time is inversely proportional, which means bandwidth and damping as well. The ...
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What is the relationship between bandwidth in the context of a passable range of frequencies vs bits per second being transferred

I am in school for electrical engineering. I am still in introductory circuits. I have seen bandwidth used in the context of a Bode plot, which was describing the range of frequencies that a filter ...
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Creating a Range Profile

I am relatively new to the radar/signal processing community. However, my team has been struggling in developing a range profile in our programming. Here are the details for a NI LabVIEW forum I ...
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3 answers
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I am having trouble measuring the amplitude of a 97 MHz signal with an oscilloscope with a bandwidth of 100 MHz

First, I designed a Colpitts oscillator with a frequency of around 94-97 MHz. I added a common emitter amplifier to the design to increase the output amplitude of the oscillator, then I connected the ...
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Bandwidth distance product

A fundamental principle of communications states that for any given transmission medium, bandwidth-length product is constant. I know that optical fibers, for example, are used for high data rate ...
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Maximum bit rate over a communication channel

Shannon formula C= B log (1+S/N) Is this formula applied for baseband transmission only? or for both baseband and passband modulation? Can we apply it without any changes to any modulated signal? What ...
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Why do we use low frequency with copper wires and high frequency with air and optical fibers?

The bandwidth of twisted pair copper wire is low. Why can low frequencies propagate longer distances through copper wires than high frequencies? On the other hand, high frequencies can propagate long ...
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Acceptable overshoot, accuracy, and control bandwidth of a buck converter

I am designing a closed loop buck converter and was wondering what would be the acceptable values/performance for control parameters like accuracy, control bandwidth, and overshoot. I know that the ...
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Gigabit Ethernet 1000BASE-T and Fast Ethernet 100BASE-T

I have this basic question. Gigabit ethernet has two things - 1000BASE-T and 1000BASE-TX. And Fast Ethernet has 100BASE-T. Ethernet has 4 twisted pairs. Can someone tell me which are half duplex and ...
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100 BASE Tx Ethernet question

I am going through this Wikipedia article - Fast Ethernet and got this below table. Can someone please explain why there are 3 line codes : 4B5B, MLT3 and NRZ-I done? Why all 3 are done? Also can ...
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ADXL345 Accelerometer data rate vs bandwidth

I recently started working with the ADXL345 Accelerometer and got a bit confused on what's the difference between the data rate and bandwidth. From the ADXL345 datasheet p14, we can see the different ...
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Question regarding bandwidth of digitally modulated signals

Assume that there are two carrier frequencies, 20 GHz (RF) and 200 THz (Optical). Both of these carrier waves are modulated by a digital signal using QPSK scheme. Consider the frequency spectrum (or ...
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8 votes
1 answer
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Why are coaxial cables typically faster/longer than twisted pairs?

I'm having trouble understand why coaxial cables tend to have higher bandwidth compared to twisted pairs. I couldn't find any source explaining why, they just mention the fact. For instance: "In ...
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Bandwidth of signal

What exactly do we mean the signal bandwidth is the range of frequencies the signal is made of?Is this referring to the Fourier transform of the signal in the frequency domain?
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Impact of Bandwidth Increase on Shannon Capacity

What is the impact of doubling of bandwidth on Shannon Capacity, assuming noise power spectral density and signal power remain the same?
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Common collector

I've created the following circuit in PSpice: I was asked to simulate the circuit and create its Bode plot. I have done that and ended up with this : I suspect that what I've got is incorrect ...
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What is the bandwidth formula for pulse code modulation (PCM)?

The image below shows the formula for the bandwidth of pulse code modulation (PCM.) There are two questions I want to ask: Bandwidth of the PCM signal waveform is bounded by \$ B_{PCM} = \frac{1}{2}(...
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Q factor of antenna in receiver circuits

I have a quite broad question about the significance of the Q factor (and especially that one of the antenna) in receiver circuits. Say we have an abstract receiver consisting of an antenna and the ...
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1 vote
1 answer
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Why is quantization defined in powers of integer multiples of two in digital image processing?

I have been studying quantization in the context of digital image processing. I referred to the 4th edition of the book titled Digital Image Processing by Rafael C. Gonzalez and Richard E. Woods. In ...
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2 answers
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Design Methodology for Non-Inverting Summing Amp

I'm trying to design an op-amp circuit to sum up four voltages by using a non-inverting summing configuration. You can see it in the circuit below, though for illustration's sake, the resistor values ...
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3 votes
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What is the upper frequency limit for an op-amp integrator?

I'm designing a circuit to process a di/dt signal. As the input is the differential of the measured current, I have to integrate the voltage to provide a representation of the current. The duration of ...
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What is bandwidth here?

The voltage(rms) created by thermal noise is: What is the bandwidth(Δf) of the thermal voltage?
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3 answers
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The speed of light is 3*10^8 m/s and data transmission rate of optical fiber is ~100 Tb/s, how do we calculate data transmission rate?

How do we calculate data transmission rate? Is there some formulas that is involved? Fiber optic cables beat copper in this department, and it isn’t even close. Fiber optic cables are made of tiny ...
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What could be the reason for degradation in the pulse shape in this instrumentation?

I'm experiencing long fall time issue for a 0.5ns pulse duration and 3MHz optical pulse source. The manufacturer test report provides the following pulse shape for the optical pulse. I don't know how ...
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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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2 votes
2 answers
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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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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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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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14 votes
5 answers
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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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2 votes
2 answers
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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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2 votes
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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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2 votes
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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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8 votes
5 answers
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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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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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3 votes
4 answers
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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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1 vote
1 answer
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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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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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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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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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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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3 votes
4 answers
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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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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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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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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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