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
250
questions
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30 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
86 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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28 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
60 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
103 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 ...
2
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2answers
64 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
5k views
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
57 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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0answers
43 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 ...
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2answers
82 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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0answers
32 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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0answers
28 views
Solving PLL Loop BW Transfer Function
š(š )= (1+š .š¶2.š
2)/(š .(š“3.š ^3+š“2.š ^2+š“1.š +š“0)
C2 = 0.0000001F
R2 = 1000 Ohm
A0 = 0.000000106034
A1 = 1.27859848E-12
A2 = 4.5011166848E-18
A3 = 4.31278848E-24
G(š )= (š¾šš.š¾š£šš.š(š ...
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2answers
77 views
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
82 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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0answers
38 views
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
38 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
59 views
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 ...
0
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1answer
48 views
why a channel needs 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 ...
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2answers
107 views
Why does a higher bandwidth allow a higher data rate [duplicate]
I have not taken any signals processing classes yet but I am interning at ATnT in the RF department. I do not understand why higher bandwidth increases data rate and the other answers did not make ...
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1answer
79 views
How does long-distance communication requires wide bandwidth? [closed]
I'm new to EE, and I was reading an introduction book which says:
long-distance communication requires wide bandwidth
Can anyone give me an intuitive example to understand it? I only know that ...
1
vote
1answer
69 views
disagreement between theoretical calculation and measurement of upper cutoff frequency of a circuit based on RG58 coaxial cable
For a 100 meters RG58 coaxial cable, according to the datasheet, the capacitance of the cable is 10 nF and the inductance is of 25 ĀµH approximately. A sinusoidal voltage is applied at the input of the ...
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0answers
30 views
buffered Op-amplifier
I am trying to simulate a buffer with an op-amp using CMOS, I am using Cadence. The phase margin I am getting is negative (not stable) about -272 deg, I am trying to reach 50 deg for a gain of 86 and ...
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2answers
79 views
Testing limitations of a low bandwidth cheapie oscilliscope
Learning basic electronics. Have a few multi-meters.
I'm researching "cheapie" less than $100 oscilloscopes.
I read that the most important spec is bandwidth.
I've noted that $40 to $100 scopes ...
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0answers
46 views
Troubleshooting butterworth bandpass gain stage issues
I am having issues solving the gain stage section of my bandpass filter design. I used a multiple feedback 6th order lowpass and a 6th order sallen-key high pass to get a bandpass filter with cutoff ...
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2answers
49 views
Can we get higher internet speeds even with low BW message signals?
Consider a case where iām listening to a recorded audio on internet.Basically the useful audio Frequency range lies b/w 40hz to 4khz, which has a BW of 4khz which is pretty low ,does that mean the ...
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3answers
55 views
Does data rate depends on Frequency not on BW?
If we have two RF signals of 900Mhz and 1800Mhz both of equal Bandwidth 20Mhz which one has higher data rate?
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1answer
54 views
In RF433 Mhz module What is the Bandwidth and Data rate that used to transfer data?
many of document I have read it that tell me this module has 2MHz and Data rate equal to 10Kbps and using ASK modulation how did it transfer 10Kbps on 2MHz what my question is why did used a large BW ...
0
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3answers
67 views
Making Sense of oscilloscope specifications
When looking for oscilloscopes, you often see the following specs:
bandwidth [in Hz]
sampling rate [in Samples/s]
capture rate [in waveforms/s]
record length [in pts/channel]
My question is: How are ...
0
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1answer
38 views
What is the relation between bandwidth and data rate?
If I have a 20Mhz bandwidth provided by my 2.4ghz router then will my internet speed will be 20M symbols per sec which is equal to 20Ć4= 80Mbps (considering 16 qam modulator with 4 bits per symbol)
Is ...
2
votes
1answer
59 views
Amplitude influence in the output signal in inverting op-amp
I testing an inverting op amp circuit in LTspice.
First I observed the graphic for the gain, and calculted the bandwidth of the circuit that is 11995Hz.
Then I did a simulation at that frequency, and ...
5
votes
1answer
112 views
2.6 GHz microstrip patch antenna with 100 MHz bandwidth
I'm trying to design a microstrip patch antenna @ 2.6 GHz. The result I got is good but the antenna is very selective and I haven't been able to increase the BW.
Currently, the BW is 40 MHz and I ...
1
vote
1answer
61 views
what is the meaning of BLE data rate 1Mbps?
I am using BLE HM10 module which is BLE 4.0 1Mbps
assume I have 1000000 data bits to send within a second, so I need 1Mbps bandwidth,
Is 1Mbps only for Data bits?
or 1Mbps means complete ...
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0answers
47 views
LC filter, frequency limit?
Do practical implementations of LC filters have a limited bandwidth over which they operate? ie. Would they start to attenuate less as the frequency of the input signal get very high (MHz->GHz)?
3
votes
5answers
790 views
How can I know a signal's bandwidth before sampling?
Shannon's theorem tells us the minimum sampling frequency based on the bandwidth of the signal which has to be sampled.
But I wonder, how can I know the signal's bandwidth before sampling it?
It is ...
2
votes
2answers
216 views
Bandwidth of pentode amplifier
Why is the bandwidth of pentode amplifier larger than the bandwidth of triode amplifier?
I have searched the following books but can't find the answer:
Electronics devices and circuits by Rajiv ...
2
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1answer
272 views
TL431 Loop Compensation
I'm trying to understand this material from C.Basso regarding TL431 compensation (Designing Compensators for the Control of Switching Power Supplies
If you refer to pg.110, there is one example ...
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0answers
20 views
inclinometers signal bandwidth
the answer here suggests that inclinometers are low bandwidth devices by design. But how low is low ? Or what difference will there be between a 6.25 Hz signal bandwidth device and a 62.5 Hz one ?
2
votes
2answers
183 views
How to generate 100 A at 20 kHz?
I have interesting problem to overcome and seek some advice. I need to test different hall effect sensors and magnetic cores. I am currently stack at issue of bandwidth. I tested sensors at DC using ...
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1answer
89 views
How do Software Defined Radios have such big bandwidth?
I've noticed that the majority of "amateur" SDRs have ADCs with a sampling rate not higher than 20 MSps, but still the HackRF One for example can scan it's whole frequency range (1MHz to 6GHz) in the ...
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4answers
117 views
Why we need bandwidth with ASK?
Now I know that this question might sound silly, that is because apparently I am missing something here. Basically my question is, if ASK works as on/off keying meaning that provided we have an ...
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0answers
83 views
op amp design for bandgap
What values of the main parameters of an op amp are suitable in a bandgap reference design? The purpose is to obtain a smaller temperature drift in the range -40 to 125 C.
The model I am using now is ...
0
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0answers
58 views
Confusion about sampling rate of a scope and its bandwidth [duplicate]
In sampling theory the BW is determined by the half of the sampling rate. But in a scope things seems to be different if I'm not mistaken.
But for example if you look at the front panel of the ...
0
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2answers
187 views
How does the formula for calculating Low and High Frequency in a Band-pass Filter occur?
Our professor told us that we should use the formulas below to calculate the
F-high and F-low frequencies that our band-pass filter should have.
$$F_\text{low}=\frac1{2Ļ\,R_1\:C_1}$$ and $$F_\text{...
0
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3answers
326 views
Square wave spectrum and knee frequency
There is this rule of thumb to estimate the required bandwidth of a digital signal by its rise time:
$$
\text{f}_{\text{knee}} = \frac{0.5}{\text{t}_{rise}}
$$
This knee frequency is described in "...
6
votes
1answer
549 views
Long-tailed pair - gain and bandwidth
I'm trying to understand this schematic of this differential probe:
I marked some blocks. I have some questions about the block I marked "Long-tailed pair" (LTP). I have no experience with LTPs so ...
0
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1answer
47 views
Is there a configuration where a circuit acts as Bandpass filter in one direction and Bandstop in other?
I am not an expert in electronics. Hence, I am looking for a broad conceptual answer.
Is it possible to a directional Bandpass/Bandstop filter i.e. Bandpass in one port and Bandstop in another.
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1answer
50 views
what does bandwidth in a channel really mean?
I'm new to EE, just a question on bandwidth in a channel. The book I'm reading describe the definition of bandwidth as
The term bandwidth can refer to the number of bits per second that a channel, ...
5
votes
3answers
1k views
How do I find an ADC circuit's bandwidth experimentally?
I'm trying to measure the bandwidth of a circuit that I've built. It's an analogue-to-digital converter (ADC) with some input protection and biasing. The ADC samples at a constant/fixed 50 kSa/s.
...
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1answer
86 views
How high should I make an FSK modulation index value?
After consulting with the radio manufacturer about a setup for my FSK radio module (HM-TRP), they have suggested I program it with the following values when setting up the module for 115kbps:
...
3
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0answers
60 views
CA3140 wideband output amplifier
The following circuit is nearly exactly what I need for the output stage of my function generator:
datasheet: https://www.renesas.com/us/en/www/doc/datasheet/ca3140-a.pdf
What I don't understand is ...
