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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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How have fiber optic bandwidths improved over time? [closed]

I want to build a sense of how fiber optic transceiver technology has improved over time, and what relevant physical limits constrain it in the limit. For instance, ChatGPT tells me that in 2010 ...
Jsevillamol's user avatar
1 vote
0 answers
134 views

What is the range of bandwidths between datacenters? [closed]

I am trying to estimate the typical bandwidth between data centres, especially in the context of high-load applications such as AI training. My current approach is as follows: Modern transceivers ...
Jsevillamol's user avatar
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Why does photodiode junction capacitance affect operating bandwidth? (from a semiconductor physics model perspective)

Here is a typical equivalent circuit diagram of a photodiode. I feel like this circuit model broadly makes sense to me. You have a diode, in parallel with the junction capacitance. The photocurrent ...
genericpurpleturtle's user avatar
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Difference between radio transmitter roll-off and bandwidth-time (BT) product

For any radio transmitter, the output signal will likely have a shape filter to manage bandwidth. However I am struggling to understand the relationship between a roll-off (e.g. 0.35) and a bandwidth-...
toddy's user avatar
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2 answers
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Is this the correct way to make a bandpass filter?

I'm trying to make a bandpass filter for a low voltage noisy electrical signal coming from a K-Type thermocouple To identify the frequencies I would need to filter out, I make a spectrum diagram using ...
Official Pyramid's user avatar
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1 answer
105 views

I'm trying to design a CE BJT amplifier with 260 gain and Bandwidth of 5.5Mhz

I'm struggling to design a common-emitter BJT amplifier for my college project. for this i selected a BC547 transistor and I have done the calculations by Assuming my Vcc as 12V. then I took Vce = 5V ...
Janitha Karunarathna's user avatar
1 vote
1 answer
79 views

Modulation Bandwidth of LED

Following on my previous post I have photodiode connected to OpAmp in inverting transimpedance configuration. (Circuit diagram can be found in previous post). Excitation source is 4000K LED with ...
LifeIsBeatiful's user avatar
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How to determine band-pass frequency and bandwidth in photodiode TIA circuit

I'm trying to figure out how a photodiode amplifier circuit works. It is used in my university plasma physics lab to measure plasma density through laser interferometry. This circuit was designed 20 ...
Harry Furey-Soper's user avatar
5 votes
2 answers
757 views

Slew rate and Bandwidth for 5 MHz signal

I'm trying to amplify a sine wave signal with opamps of high bandwidth and slew rate. It works fine up to about 700 kHz, then the gain decreases and about 1 MHz it's only 1, when it should be about 5. ...
Gos's user avatar
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How to calculate the maximum measure level on the spectrum analyser?

Suppose that all individual spectrum lines in the range from 1 MHz to 2 MHz have the same level of 40 dBuV. The distance between the spectrum lines is 35 kHz. Measurements were performed using a peak ...
HAPU's user avatar
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4 votes
3 answers
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Expanding oscilloscope bandwidth by amplifying higher frequencies

Is it possible to increase the oscilloscope bandwidth by: Adding an amplifier circuit to the oscilloscope input. This circuit would have a frequency-dependent gain selected in such a way as to ...
piotr's user avatar
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op-amp bias current measurement

I am trying to measure the offset voltage and bias current using the technique below (Figure 2 and Figure 3) op-amp servo-loop My question is: can I use NJM4580 as the op-amp under test and use the op-...
Fateme's user avatar
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4 votes
1 answer
105 views

How does the "Multiplying Bandwidth" specification relate to a DAC output's maximum bandwidth

I'm struggling to understand what it means for a DAC to have a Multiplying Bandwidth of 200kHz. Does it mean that the max frequency component in the DAC's output cannot exceed 200kHz for reliable ...
Ninja Ron's user avatar
0 votes
3 answers
196 views

How can the ADC bandwidth be higher than the sampling rate?

From a hobbyist perspective, the sampling rate of an ADC must be at least twice of the input signal. As I was looking for an ADC to digitize a demodulated signal, I found that some ADCs like the ...
Tintin's user avatar
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2 votes
2 answers
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How to determine the bandwidth of an op-amp in this case?

Regarding a TIA amplifier such as below: If IPD is a pulsed current produced by the photodiode and if the pulse width is 1 ns, what bandwidth of op-amp would be necessary? EDIT: I also don't care ...
GNZ's user avatar
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1 answer
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How much gain I am getting and with the 2 stage transistor amplifier attached with a Global NFB [duplicate]

This is just a direct manual solving directly subtituting values in a formula with disregard to temp etc. Sorry for the incomplete information here are the goals of this: "gain of 100≤Av≤130 and ...
Lumiere's user avatar
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0 answers
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How do I tune ARM Socrates NIC QoS Address Latency Target Registers to get balanced bandwidth between two AXI Initiators?

I'm learning about the ARM Socrates NIC QoS features to provide balances arbitration between two AXI Initiators created two different sized transactions. AXI0: 64B (awsize = 8B, awlen = 8 beats) AXI1:...
wandering_leo's user avatar
0 votes
3 answers
336 views

Is this transistor amplifier with low pass filter correct? How should I measure the gain and frequency range?

My goal is a gain of 100-130 and a frequency range of 1-10 kHz.
Lumiere's user avatar
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2 answers
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Long falling edge of a VCSEL laser's pulses

I've been trying to drive a 940nm VCSEL (Part No. V105Q131A-940) with an iC-Haus HG20M VCSEL driver. When given short pulsed signals (pulsewidth of ~100us), the optical signals detected by a ...
Boan Fang's user avatar
1 vote
0 answers
89 views

What's the impact of super high VSWR? Need help from experts

Is it realistic to make an antenna system with VSWR as high as 20 to transmit 50MHz signal? I am thinking of increasing bandwidth of a small antenna by sacrificing its mismatch efficiency. Assuming ...
perfectconan's user avatar
2 votes
2 answers
136 views

Does this antenna break Chu's limit?

I ran into this antenna datasheet and found it interesting. https://www.johansontechnology.com/datasheets/0433AT62A0020/0433AT62A0020.pdf From my understanding, the return loss graph on page3 shows ...
perfectconan's user avatar
1 vote
0 answers
117 views

SDR Bandwidth and sample rate

I saw that SDR has two parameter: bandwidth and sampling rate. I would like to know the difference between them because i saw a 56MHz bandwidth SDR but by looking at the chip used inside the sampling ...
PiraLezz's user avatar
0 votes
2 answers
162 views

Why is the Gb/s usually matched with the GHz for SDI?

My knowledge in electronics and RF(because high speed data) is very surface level but attempting my best. I'm attempting to do an application which utilizes 3G SDI, but am not understanding why there ...
andy's user avatar
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2 votes
0 answers
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Bandwidth of PXIE-6738

Hope this is the right forum. I can't find the explicit bandwidth of this analog output module: PXIE-6738 from National Instruments. In the data sheet there are two specifications that may be relevant,...
DarkBulle's user avatar
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1 vote
0 answers
107 views

Second Order Low Pass Filter, replacing inductor with VCCS and Capacitor

My instructor told us that we can replace an inductor in the following way. Now, I want to construct a second order low pass filter using Voltage Controlled Current Source, Capacitor, Resistor of ...
Manas Kesharwani's user avatar
3 votes
2 answers
602 views

Can analog bandwidth be modeled as an RC low-pass filter in this way?

The analog bandwidth of this scope is given as 250 MHz. When we see the term analog bandwidth, can that be modeled as an RC low-pass filter whose roll-off frequency (-3 dB point) is 250 MHz?
ty_1917's user avatar
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5 votes
2 answers
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Why do more transitions imply more bandwidth consumed?

First thing first, I found a question very similar to this one, so if the answer is already in that one please write it down and I will look there. While studying CAN bus, I read the distinction ...
KaleM's user avatar
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1 answer
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Bandwidth of a DAC

Could anybody specify what does this bandwidth means in DAC PWM? Source: Designing high-performance PWM DACs for field transmitters (page 2) The bandwidth of a DAC?
Fc3 Fc3's user avatar
1 vote
1 answer
200 views

Does the idea of bandwidth make sense for a system with an infinite DC gain?

I'm thinking specifically of systems with ideal PID controllers. The transfer function will always have an integrator term, which, if I understand correctly, means it will always have infinite DC ...
Mikayla Eckel Cifrese's user avatar
1 vote
1 answer
215 views

Determining the sampling rate / frequency from a graph

I don't understand how the two graphs in the image below are connected. The context is signal processing and sampling rate (+ its relation to bandwidth). I don't know the exact terms to look up. I am ...
questions change the world's user avatar
1 vote
1 answer
443 views

What is the highest practical bandwidth of a linear voltage regulator/LDO?

I am trying to evaluate what the highest pratical bandwidth of linear regulator/LDO is. To be more precise, I am looking the bandwidth of the transfer function Vout/Vin. I think the bandwidth is set ...
Jess's user avatar
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-1 votes
2 answers
227 views

Why do photodiode transimpedance amplifiers care about signal frequency?

I'm designing a circuit to amplify low light levels (in the range of 0.1 uW) of measured black body radiation for application in a pyrometer. I don't have much experience with this kind of stuff so I'...
Winston Wilhere's user avatar
0 votes
1 answer
168 views

Photodiode amplifier with cascaded amplifier

I have designed a photodiode circuit using the OSD35-5T photodiode from Centronic. I am using the LTC 2054HV as a transimpedance amplifier (TIA) and the LTC2051HV (dual opamp) as the next stage ...
LabMat's user avatar
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1 vote
1 answer
177 views

Can a frequency multiplier (e.g. doubler) impact signal bandwidth?

My understanding is that if a single tone at frequency F is input to the frequency doubler, one should observe at its output in the spectrum the same tone but now at a frequency 2F. What happens if ...
Akhaim's user avatar
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1 vote
2 answers
736 views

Why does the amplitude of my output signal increase when I increase frequency of the input signal?

The signal generator outputs a sine wave into an LED which emits light onto a photodiode. The photodiode is connected in a TIA circuit and then the output is displayed on an oscilloscope. The ...
rockky007's user avatar
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2 votes
1 answer
106 views

How to set system bandwidth?

I would like to know how to set minimum system bandwidth according to the following requirement : I have a system regulating an output. In nominal operation, the system has to regulate its output to \...
Jess's user avatar
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0 votes
0 answers
47 views

How do I decide a good bandwidth in an amplifier for DC measurement?

I am looking at this instrumentation amplifier (INA). I want to have a gain of 1, so I must use the low bandwidth mode of the INA, which is 200kHz. Is this bandwidth Ok to use for DC measurements? The ...
Alex's user avatar
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2 votes
4 answers
489 views

Is RC frequency response related to series RC or parallel RC?

So in playing around with some frequency response stuff I made this circuit: And I found that the cutoff frequency value is set by the Feedback Resistor and the capacitor. Take note that the ...
Toasty's user avatar
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0 votes
1 answer
142 views

Keysight bandwidth and rise time

According to the following application note from Keysight, one way to know what device to take for measuring a signal is to measure the rise time. Then according to the rise time of the system under ...
Jess's user avatar
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1 vote
2 answers
239 views

Effect of GBW and slew rate for "small signal"

I would like to better understand how to choose an op amp for high speed application and more precisely I would like to better understand how the GBW and the slew rate influence the transient response/...
Jess's user avatar
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0 votes
3 answers
624 views

How do I calculate resistor values for a second-order bandpass filter to achieve unity gain at 1 kHz?

The bandpass needs to have a bandwidth of 250 Hz with a centre frequency of 1 kHz. The values I've calculated so far are R1 = 1000 Ω, R2 = 1000 Ω, C1 = 140 nF, and C2 = 180 nF. I calculated these ...
Lexifare26's user avatar
7 votes
4 answers
1k views

System bandwidth formula

Does anyone know how to demonstrate this formula? It is also worth noting that you should consider your entire system bandwidth. You need to factor in both the bandwidth of your probe and your ...
Jess's user avatar
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-1 votes
1 answer
146 views

PCIe bus bandwidth

Calculate the bandwidth of a PCIe link with 8 lanes, 8b/10b encoding and 2.5 GHz frequency. I tried the following formula but I am not sure of its correctness: BW = lane data rate × encoding × no. of ...
Mina Mounir Farid Gendi's user avatar
1 vote
2 answers
162 views

How can oscilloscopes be immune to radiated noise?

I have an oscilloscope which has a bandwidth of 500 MHz. It means that all signal with a frequency under 500 MHz can be observed without (a lot of) distortion. Noise radiated is said to begin at ...
Jess's user avatar
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0 votes
1 answer
342 views

How do single-optical-fiber bidirectional communications work?

In the past, I have dealt with fiber optic network communication devices that utilize two fibers, RX and TX, each being dedicated to one direction. I was under the impression that two fibers are ...
Ryan Griggs's user avatar
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2 votes
2 answers
261 views

Discerning slew rate and bandwidth limitations

What I get is that, considering a 2 stage OTA, we have 2 effects that limit the amplitude and frequency of the amplified signal: Bandwidth of the amplifier: as the frequency of the input signal gets ...
concerned middle age man's user avatar
16 votes
3 answers
3k views

How is Wi-Fi throughput so high?

While reading specs of a new ASUS Wi-Fi router - it said to have 2 GBPS throughput. How could it reach such throughput if all the WIFI bandwidth should be small and close to 2.4 GHz and 5 GHz?
Ron Vaisman's user avatar
0 votes
1 answer
195 views

Oscilloscope bandwidth for motor driver applications

What should be the oscilloscope bandwidth for testing BLDC motor drivers? Is 20MHz bandwidth a good choice? Switching frequency 16-20kHz Test condition: loaded 20A, 24V Test signals: High side and ...
yardi's user avatar
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0 votes
2 answers
769 views

Cut-off frequency for RC-filter with two resistors and two capacitors

I'm sort of hard stuck on this question regarding RC-filters. I've tried calculating the total resistance of the circuit but I felt that it was the wrong way. Than I tried calculating Vout in terms of ...
MechanicalEngineerNeedsHelp's user avatar
0 votes
1 answer
961 views

VNA: Why does the IF bandwidth affect the measurement speed?

I believe I understand the role of the IF bandwidth (IFBW) in a VNA measurement: The signal is mixed down to the intermediate frequency (IF) and the receiver detects the signal in a frequency band ...
schtandard's user avatar

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