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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3answers
76 views

How does the maximum transmission rate depend on the carrier frequency?

This question refers to the following excerpt from Computer Networks by Andrew Tanenbaum: The amount of information that an electromagnetic wave can carry is related to its bandwidth. With current ...
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1answer
23 views

How to calculate the transmission ( channel ) bandwidth in a digital communications system?

Is it the bandwidth ( BW ) of the individual pulse or should I generate a random process and calculate the BW from its PSD. In my class we considered it the bandwidth of the raised cosine when we were ...
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0answers
25 views

Theoretical bandwidth of pcm system

Can anyone help me derive the bandwidth of pcm system, this is what I got. All log to base 2 Theoretical max bit rate(Rb) = 2*B*log(L) - - - - - (eqn 1) B is bandwidth of channel L is number of ...
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2answers
45 views

Maximum bit rate of a noise less channel

I am not able to find any source giving reason as to why the maximum bit rate in a noise less channel is twice bandwidth multiplied by log L base 2 where L is number of symbols used. What I came ...
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1answer
61 views

What bandwidth is needed for an arbitrary digital signal?

I am building a fiber-optic data link, with a laser driver and photodiode receiver. My goal is to transmit data at 50Mbit/s. I'm looking for what bandwidth this would take. Obviously 50MHz would not ...
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4answers
47 views

Remote Controlled Vehicle Design

For our term project we have to design a vehicle which has to have three functions; move forward, turn left and turn right. The vehicle will have two dc motors that will work at the same speed for ...
0
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1answer
34 views

What is optical bandwidth and electrical bandwidth

I was reading a book about Optical Wireless Communication. In the chapter where the transmitters are explained, there is a figure showing two types of bandwidth for LEDs. This confused me a bit, ...
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1answer
22 views

Bandwidth-Data rate relationship

From a Data Comms textbook: These are the approximate square waves (Fig 3.7a and 3.7b): This is where the effect of changes in bandwidth on data rate is determined: The problem is the ...
3
votes
1answer
88 views

Why does the 802.11b DSSS signal have 22 MHz of channel width? How does the information get spread over that width? [duplicate]

This topic has got me so much confused. In terms of Wi-Fi, when we say the 802.11b has 22 MHz of Channel Bandwidth, what does it mean? When we refer to a particular Channel No. say Channel 1, it has ...
0
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1answer
36 views

What frequency bandwidth should an accelerometer operate for measuring punching and kicking movements?

I'm trying to choose the bypass capacitors for a schematic circuit that measures the acceleration (in g) for punching, kicking, throwing, etc. But I don't know what to place on the x, y, z output of ...
1
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1answer
94 views

Ideal wireless channel (coherence time/bandwidth)

Wireless channels can be characterized as either slow or fast fading based on their coherence time and signal length. Similarly, they are either flat fading or frequency selective depending on their ...
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0answers
40 views

High speed (EDR) data transfer possible with HC-05 bluetooth module?

From what I understand, the popular HC-05 bluetooth module is using a CSR BC417 controller part, which supports EDR for 2/3 Mbps modes, also up to 3Mbaud UART interface for the mcu. Assuming the mcu ...
2
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1answer
122 views

Why Bandwidth Affects Response Speed

This is a follow-up question to (this question). Here is the amplifier section in question: In the answer, the author (@Brian Onn) gives the following explanation: "Slow vs. fast is not about ...
0
votes
1answer
131 views

Measuring Q and Bandwidth of an RLC series circuit using Oscilloscope

I have a HNC Lab assignment coming up. As part of the prep for the lab work we have been given an RLC series circuit for which we had to calculate some values such as volt drop , Wn, Q and Bs, which ...
2
votes
1answer
124 views

3-dB Frequency of second order transfer function

How can i obtain the 3db frequency of the each transfer function ? My attempt: My guess is both transfer functions have the same 3db frequency.But equating the magnitude to 0.707 gives a fourth ...
0
votes
1answer
57 views

What determines the required bandwidth of current sensors in an electric motor drive?

Most motor drive control systems incorporate current feedback of some description. What determines the required frequency response or bandwidth of the current transducer? Is there any other ...
5
votes
3answers
987 views

Bandwidth of inverting and non-inverting op-amps

If the same op-amp is used in both inverting and non-inverting modes (with same closed loop gain using appropriate resistors), will the closed loop bandwidth of the op-amp in both cases be the same? ...
1
vote
1answer
128 views

Loaded Q-factor of parallel RLC with series resistive load

So I have been studying resonant RLC-circuits, and have come to loaded Q-factors. At present I am trying to figure out the Q-factor of a circuit like this: simulate this circuit – ...
0
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1answer
434 views

How can I find the bandwidth of a sinc function? [closed]

I have a solved problem and it says the bandwidth of the function: $$sinc(\frac \omega {20000}) \cdot rect(\frac \omega {20000 \pi})$$ is 10 kHz. Why it is not 20 kHz or 40 kHz ?
0
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1answer
42 views

Throughput and speed of data transmission cables [duplicate]

What are throughput and speed limiting factors in an ethernet or any other type of cable which is used for data transmission?
0
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1answer
54 views

Calculations: Antenna specs; SWR, Bandwidth, Rad.Eff, Q-factor

Is it possible to give approx. answers about what an antenna is capable of? There is a lot of formuals out there, but every single one I found is based on actual measurement; input, output, SWR ...
0
votes
1answer
244 views

Practical Opamp integrator problem

The opamp has an unity gain of 1 MHz.So when the resistor in parallel acts a feedback to bias the opamp stable.So if not for the capacitor,the circuit would have been a inverting amplifier with ...
0
votes
0answers
56 views

Nyquist capacity of a noiseless channel

I am confused about the Nyquist capacity of a noiseless channel. My textbook states the result as 'A maximum of \$2B_c\$ independent pieces of information per second can be transmitted error-free over ...
0
votes
2answers
60 views

Necessary Bandwidth of Current Shunt Amplifier

I want to measure a bidirectional current using a Shunt and Current-Shunt Amplifier in High Side topology. The ADC will work at a lower sample rate (<10 kSpS) than would be required for the faster ...
2
votes
1answer
99 views

Operational Amplifier gain bandwidth product

If the gain bandwidth product of an operational amplifier is a constant and |Vout/Vin| is also a constant does that mean that the operational amplifier will not function for all but 1 frequency? ...
2
votes
2answers
81 views

Measuring Bandwidth of a 1e10 gain TIA

I'm trying to measure the bandwidth of a TIA with a gain of 1e9 on the first stage and 10x on the second stage. The first stage OpAmp is the LTC6268 with a 1G Ohm feedback resistor and the second is a ...
0
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1answer
42 views

Open-loop gain vs supply voltage

I have a question regarding the relationship between open-loop-gain and supply voltage. Using op270 as an example: We need to operate this device at +-5V. The datasheet has a plot (Figure 19) which ...
5
votes
1answer
444 views

What is bandwidth?

I'm having hard time understand what bandwidth really is? The book i'm using defines it as the width of a signal's spectrum (where spectrum is the range of frequencies in a signal). So, for example, ...
4
votes
3answers
468 views

gain, bandwidth and GBWP of current to voltage converter with op-amp

It might be a silly question since I am new to circuits and have little knowledge about it. I've learned that gain of a current to voltage convertor with op-amp is determined by feedback resistor ...
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votes
4answers
128 views

Are radio stations with higher frequency able to transmit higher quality audio?

e.g. a radio station at 100 mhz on FM vs a 50 mhz radio station. Wouldn't the latter have a lower bandwidth therefore lower quality audio/bit rate? If this is true, this must also mean that 2.4ghz ...
1
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1answer
130 views

Am I getting DC bandwidth correctly?

I am computing Johnson and shot noise in a DC circuit, where I have an Arduino Due sampling with "delay(100);", i.e. at 10Hz. Sampling rate and bandwidth follow Nyquist sampling theorem. According ...
0
votes
1answer
41 views

Can signal arrival times be a function of receiver bandwidth?

Lets assume that the speed of light is exactly \$3\!\left(\!10^{8}\!\right)\text{meters}/\text{second}\$. Suppose we have a transmitter on the surface of the earth emitting a signal at 1000 MHz and ...
3
votes
5answers
1k views

Transmission of a digital signal over a medium

A digital signal is said to have a infinite bandwidth. If a transmission medium cannot have infinite bandwidth then how can a digital signal be transmitted over such mediums? Please correct me if I ...
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5answers
442 views

Does increasing the amplitude of a signal also increase the data rate?

I face an ambiguity when considering the carrier frequency, signal frequency, bandwidth and data rate. When I consider the Shannon formula, I wonder if increasing the transmission power also means ...
2
votes
3answers
152 views

What is the analog bandwidth of general purpose ADCs?

I am making use of the dsPIC33FJ64GP802's ADC to do Undersampling and for that, I need to know the analog bandwidth of the ADC of this Microcontroller. My signal is around a few MHz. I have already ...
1
vote
1answer
246 views

Class J RF Power Amplifier

What is a Class-J Amplifier configuration? Does it work in a push-pull configuration similar to an A/B? How is it physically different to an A/B? Where can I see a basic schematic? I have read ...
0
votes
2answers
158 views

Relation between reflection (coefficient) and bandwidth

I am reading into single stage microwave amplifiers and how to design for a specific gain (source 1, source 2 warning PDFs!). In both sources the claim is made that the highest bandwidth is achieved ...
2
votes
3answers
175 views

What does the bandwidth of a probe mean?

For example, when I have the P2221 ( http://www.farnell.com/datasheets/1808826.pdf ),The bandwidth when setting it to 1x, would only be 6Mhz. Looking at the input resistance and input capacitance: \$ ...
1
vote
1answer
44 views

Simple question on high bandwidth Opamp reproducing low frequency signals

So if one were to use a high bandwidth Opamp, at say 10GHz, and use it to reproduce a much lower frequency signal, say in 1GHz or 700MHz, would there be attenuation or degradation of the signal?? Or, ...
0
votes
2answers
850 views

Active narrow bandpass filter with variable center frequency

I want to make bandpass filter with its center frequency variable(range 50Hz to 5kHz), bandwidth the smaller the better but not less than 50Hz.The bandwidth to be same across the range should be same. ...
0
votes
1answer
68 views

wireless sensor baud rate calculation

I need to calculate baud rate of wireless sensor which operates on 433.92Mhz and uses OOK modulation. Signal wave form and packet structure are known. Packet = 36bit (44.7ms), each bit consists of 2 ...
0
votes
1answer
87 views

Why deliberately mismatch impedances in RF?

My professor wants me to design a cascaded RF amplifier, with mismatched stages. The reasoning is to increase bandwidth. Is this correct? If so, can anyone elaborate on the theory why mismatching ...
2
votes
1answer
197 views

Buffer between high pass and low pass filter when making a bandpass filter?

For a passive filter stage, I want to combine a high pass filter with a low pass filter to create a bandbass filter. Can I just make a simple RC circuit for each and connect them together? Or would we ...
2
votes
2answers
71 views

What is the closed-loop bandwidth of the INA143 at gain 0.1?

The INA143 difference amplifier datasheet states that the device supports G=10 and G=0.1 when connected in difference amplifier configuration. However, the datasheet only gives specifications for the ...
0
votes
1answer
202 views

What's the best phone cable for DSL? [closed]

I want to know what cable I should be using to connect my demarc to my DSL modem. When I plug in my DSL modem in the utility room (which is about 20' of wire from the demarc) I get a pathetic 4Mbps ...
1
vote
2answers
49 views

Expected percentage of collisions for uni-directional wireless transmissions

I am developing battery-powered sensors to measure different parameters inside my house. The measurements are taken by simple AVR controllers (no Arduino) at more or less regular intervals and will ...
1
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1answer
178 views

Phototransistor bandwidth issue

I'm trying to sense IR wave with a phototransistor circuit. The circuit operates well under DC operations (I mean 3V or 0V through inputs). However, if a square wave is supplied from UART input, ...
0
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2answers
254 views

IR Led & Phototransistor pair bandwidth issue

I'm trying to sense IR wave with a phototransistor circuit. The circuit operates well under DC operations (I mean 3.3V through inputs). However, if a square wave is supplied from UART input, after ...
2
votes
3answers
827 views

Why is an op amp's bandwidth higher at lower gains?

If I build a resistor network where the op amp has a lower gain, it is able to maintain its gain for a larger bandwidth. Why?
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2answers
814 views

Link Capacity and the Shannon-Hartley Theorem

I'm reading Computer Networks: A Systems Approach by Peterson and Davies. One of the examples demonstrates the relationship between link capacity and the Shannon-Hartley Theorem. We can find the ...