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
214
questions
2
votes
2answers
100 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 ...
0
votes
1answer
66 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 ...
0
votes
4answers
82 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 ...
0
votes
1answer
51 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
56 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
votes
2answers
87 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.
$$F_\text{low}=\frac1{2π\,R_1\:C_1}$$ and $$F_\text{...
0
votes
2answers
62 views
Square wave spectrum and knee frequency
There is this rule of thumb to estimate the required bandwidth of a digital signal by its rise time:
$$
\text{f}_{\text{knee}} = \frac{0.5}{\text{t}_{rise}}
$$
This knee frequency is described in "...
5
votes
1answer
107 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
votes
1answer
38 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.
0
votes
1answer
41 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.
...
1
vote
1answer
37 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:
...
2
votes
0answers
38 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 ...
3
votes
1answer
53 views
Bandwidth of an oscilloscope with differential probe
I am planning to buy Rigol MSO5204 scope with a bandwidth of 200 MHz. I need to measure the timing difference between 2 (or more) signals of up to +/- 7 ns. Since this scope has 8 GS/s ...
0
votes
1answer
57 views
Sampling Frequency and Bandwidth
If i have a Buck Regulator switching at 200KHz and i want to sample the Voltage and current using OpAmp in tha path connected to ADC(12 bit).
What would be the sampling frequency to measure the ...
0
votes
1answer
42 views
feedback loop component dc converter
Consider the schematics below, the switching frequency is 250KHz, So, The cross over frequency be 250/5 = 50KHz. My ADC is able to sample at 1MS/s which is good as from the SNR perspective.Now, the ...
0
votes
1answer
26 views
Bandwidth and Data Rate FSK Demodulations
I have a question about the data-rate limitations imposed from bandwidth for FSK signals. Suppose I transmit an FSK signal with frequencies as:
$$f_1 = 2400 MHz,$$ and $$f_2 = 2401 MHz$$
that is ...
0
votes
1answer
42 views
Convering bandwidth (frequency) to bit rate without knowledge of the modulation?
How would i convert a bandwidth of say 30kHz to bps if I only know the number of bits per sample (4)? (and I was using a two chanel system). I am assuming it is simply 30KHz * 2 * 4 but this may be ...
1
vote
3answers
112 views
Bandwidth and stability of nonlinear circuit
I'm designing an antilog amplifier which produces an exponential output (0.4 mV to 4 V) for a 50 Hz sawtooth input waveform (4 mV to 4 V ramp). If this were a linear circuit, I could determine the ...
8
votes
4answers
1k views
Why do OOK transmissions have bandwidth?
With on-off keying, you have a single carrier wave at a constant frequency transmitting its presence or absence. Now I understand that the crystal will not be perfect so you will have some minimal ...
0
votes
1answer
44 views
Determining sensor bandwidth
I'm currently working on a project making use of ultrasonic proximity sensors. Unfortunately it seems as though well-documented ones are very few and far between (when compared to PIC or MOSFET ...
0
votes
1answer
34 views
TLC5926IPWPR Clock width
I'm using the TLC5926IPWPR in a design. It uses an SPI interface. The TLC5926IPWPR chip is on a separate PCB than the MCU that is controlling it. The Clock and SDO pin must go through a cable about a ...
1
vote
1answer
109 views
How to calculate the 3dB point?
I understand this until the final two lines. How does he get from 27.8766 to 1149.8hz and 7224.7rad/s?
0
votes
0answers
65 views
Bandwidth of triangular wave for desired linearity
I'm attempting to replicate the Wavetek Model 188 Function Generator with original circuitry. This function generator has a 'VCG (Voltage Controlled Generator)' input which allows the user to apply ...
0
votes
1answer
82 views
What is meant by bandwidth here?
Regarding the following text:
Dynamic Range is defined as ratio between the smallest and the largest
signals that can be measured by the system.
Smallest signal is usually the RMS Noise ...
0
votes
1answer
54 views
Bandwidth of voltage divider with PMOS switch
Planning to measure (varying under switching e-bike load) voltage from a battery.
To step down the voltage panning to use a voltage divider and buffer the output to an ADC via an op-amp.
To ...
1
vote
1answer
175 views
How does Nyquist bit rate formula relate Bandwidth, Signal Rate, and Bit Rate?
I know what each of Bandwidth, Signal rate, and Bit rate mean. But I am having trouble in their mathematical relationship with each other. I will use the notation of the textbook I am reading from (...
2
votes
2answers
99 views
Can't achieve the goals in designing and simulating Resonator circuit
Goals
I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly.
Requirements
Source Impedance \$R_s = 100\ \Omega\$
Load ...
0
votes
0answers
34 views
Choosing a position sensor (encoder) and obtaining velocity from it
How do I know how many counts per revolution I need for an encoder for my application?
I need to be able to accurately capture a 1000 Hz signal on an input side running from 1-133 rev/sec (60-8000 ...
3
votes
5answers
248 views
Please explain this formula for the relationship between bandwidth and the temporal response of a photodetector
I am reading "Optoelectronic Sensors" by Didier Decoster and Joseph Harari.
At section 1.8.2 they start explaining the relationship between rise time and bandwidth, and they give a very weird formula ...
2
votes
1answer
796 views
Optical bandwidth and electrical bandwidth
I understand the concepts of electrical and optical bandwidths, but I encountered an example problem that used the following formula to calculate the electrical bandwidth:
$$electrical bandwidth = 1/\...
1
vote
2answers
111 views
Maximum rate Shanon Hartley
i am reading computer networks and i am trying to solve an excercise.
the excercise is
What is the theoretically the maximum rate at which data can be transmitted to a 4000Hz bandwidth ...
2
votes
2answers
101 views
How does transistor bandwidth affect stability?
I was watching a video where Dave Jones of EEVBlog interviews Rod Elliot of Elliot Sound Products. Rod was discussing that he tends not to use digital chips in his designs because the chip will become ...
0
votes
1answer
53 views
Frequency response of the waveguide
So, I have signal in the waveguide that is transmitted by two modes of radiation, for which the delay is for example \$\tau_1=6\,\text{ns},\, \tau_2=6.5\,\text{ns}\$, respectively. And the energy ...
1
vote
2answers
293 views
Extension of Audio Amplifier's Bandwidth
I am curious, whether extending audio amplifier's BW (bandwidth) beyond 20 kHz has any benefits compared to 2Hz-20kHz audio BW amplifier?
Some say that high-frequency -3dB point should should be ...
4
votes
2answers
488 views
Simulating and Building a Multiple Feedback Band-Pass Filter
I have a distorted signal, and only want to allow frequencies between 95kHz and 105kHz. The input voltage is at 300mV peak to peak.
Thus, I need a Pass Band of 10kHz and a Central Frequency at 100kHz....
1
vote
1answer
96 views
What is the precise meaning of “matching impedance” for an ultra-wide band antenna, and how to do that?
Well, actually, I'm not sure I really understand what is the meaning of matching impedance, even for an ordinary antenna, but I can figure out the following: if you send a signal to the antenna, then ...
0
votes
1answer
84 views
Constant DC Load Stability and Bandwidth slewrate
For this circuit, how do I know if the rise edge was limited by slew rate or bandwidth? What's the effect of R2 and C2 on bandwidth?
-3db of this circuit in simulation is 649 kHz, I know in ...
6
votes
2answers
794 views
How to estimate the analog bandwidth?
I have created the low cost oscilloscope and need to estimate the analog bandwidth.
I do not have any specialized equipment and just trying to estimate it by watching the response to the square ...
2
votes
0answers
149 views
How to calculate a voltage/current controller bandwidth based on their gains Kp and Ki?
I am doing some experiments with voltage and current controllers, but sometimes my results are not matching what I expected. At the moment, to calculate the bandwidth of a controller, I am taking the ...
2
votes
2answers
1k views
Calculating the frequency of data lines?
I read a calculation about determining the bandwidth of USB https://www.edn.com/electronics-blogs/all-aboard-/4425691/Rule-of-Thumb--2--Signal-bandwidth-from-clock-frequency
Roughly what was said is:
...
1
vote
0answers
117 views
Finding the Analog Bandwidth of a Voltage Controlled Oscillator
We've built a current starved voltage controlled oscillator
And tuned it so it works only in the linear region, which means it oscillations between 720-840 mV, and outputs 3.6-4.4 GHz. In order to ...
0
votes
0answers
107 views
bandwidth and phase-locked loop
I've been told that phase-locked loop (PLL) increases the bandwidth and therefore makes the time constant smaller. (\$ \tau = 2Q/\omega_0 \$ and I understand \$Q \propto 1/ \delta\omega_0 \$)
I ...
0
votes
2answers
336 views
Gibbs phenonemon in real life
If I feed a square wave into a first order, passive, low-pass filter (resistor and capacitor), I get the following results on an oscilloscope (sorry, I don't know how to scale and rotate images):
Why ...
1
vote
1answer
469 views
Parallel RLC Resonance bandwidth
Good day ,I need help in understanding a practice problem that my professor gave us.
A parallel resonant circuit has Q = 20 and is resonant at ωO = 10,000 rad/s. If Zin = 5kΩ at ω = ωO
what is ...
0
votes
1answer
48 views
IEEE 802.11b bandwidth and data rates
I am self-studying on how 802.11b bandwidth and data rates are calculated, primarily those of 1 and 2 Mbps. These are my understandings, please correct them if they are wrong. Please keep in mind I am ...
0
votes
1answer
60 views
minimum readable rise/fall times in an oscilloscope
How can I calculate minimum readable rise/fall times of a signal in an oscilloscope (from practical point of view)? Does it depend just to bandwidth and sampling rate of oscilloscope? regards
0
votes
1answer
69 views
Transmission and propagation
Two stations are 400km apart from each other. You have access to a 100Mbit/s full duplex radio link which transmits packet of 4000 Bytes in each direction.
What is the transmission time?
I assume ...
0
votes
1answer
71 views
calculating maximum sense speed of amplified phototransistor circuit
I made the following photo-transistor circuit to sense light with the exact parts shown. Resistors are 5% tolerance 1/4 watt. The circuit does work, but what I would like to know is how do I calculate ...
2
votes
2answers
178 views
What are the connection between bandwidth, Nyquist criteria and quantization?
I am trying to solve the below problem and I was not able to find the relation between bandwidth, Nyquist criteria and quantization. Can you please provide some hint?
Imagine that the possible ...
