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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4answers
85 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
56 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
30 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
523 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 ...
0
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0answers
37 views

Data throughput Bluetooth Low Energy

Bluetooth 4.0 has 2 modes: Low Energy and Basic Rate (Basic Rate is split up into 3 different versions as well, but those are irrelevant). I'm interested in the theoretical and practical maximum ...
1
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5answers
103 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
2answers
92 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
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1answer
74 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
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2answers
42 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
76 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
38 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
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2answers
190 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
39 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
76 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
87 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
55 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 ...
1
vote
1answer
89 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
48 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 ...
0
votes
0answers
41 views

Bandwidth of a 1,2kbit GFSK and a 9,6kbit GFSK

I want to calculate the bandwidth of a GFSK modulation. In the task are two bitrates given, 1,2kbit and 9,6kbit, and the CC1200 (from Texas Instruments) transceiver is used for the transmission. I ...
1
vote
1answer
97 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
votes
2answers
140 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 ...
0
votes
0answers
75 views

How does a chipset determine which LTE bands it supports?

Take the snapdragon 800 and 801 chipsets. Both use the same hexagon DSP http://pages.cs.wisc.edu/~danav/pubs/qcom/hexagon_hotchips2013.pdf But a phone on verizon will only support LTE bands 4 and ...
2
votes
3answers
515 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?
0
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0answers
72 views

Latency of DDR RAM operation compared to bandwidth capacity for two memory modules at a given clockspeed

I've wondered this for a while and I need some help conceptualizing it. Why isn't Nanoseconds of latency a good measurement of speed for comparing two different memory modules, both with the same ...
1
vote
0answers
148 views

Finding the bandwith of FM by using Bessel functions with 1% rule

Question A 100-MHz carrier is frequency modulated by a 10-kHz sinusoid so that the peak frequency deviation is 30 Hz. Using Bessel functions with 1% rule, i.e. 40 dB down from the unmodulated ...
1
vote
2answers
373 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 ...
6
votes
2answers
287 views

Observing effect of household appliances on powerline communication

I had been recently working on Powerline communication modems (PLC). I put two PLC modems at different parts of my home and observed the data transfer rate between them. However, I observed that when ...
0
votes
2answers
75 views

How does the bandwidth have something to do with speed

They are saying that, if the bandwidth of a certain device becomes narrow, then its speed decreases. However, how does the speed has something to do with the bandwidth? If you are saying that the ...
0
votes
2answers
72 views

Measuring band-limited noise coming from an amplifier

I have a strain gauge amplifier and from my analysis, it will produce a low level of white noise above approximately 1kHz i.e. the power spectral density is flat above 1kHz. If I measure the output ...
1
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2answers
147 views

Determining Bandwidth of any circuit

I am getting familiar to SNR, noise calculations, thanks to this forum, however I often come across Bandwidth of the system to calculate resistor noise, to get rms noise from nV/rt-Hz, etc. I have a ...
0
votes
1answer
154 views

Gain bandwidth product of op-amps

What is the gain bandwidth product of an amplifier? (What does it mean?) How can I find the gain bandwidth product for an amplifier which has a gain of -100?
0
votes
2answers
101 views

Bandwidth of low pass filter

Say I have some low pass filter of the form: $$G(s) = \frac{a}{s+b}$$ How do I find the bandwidth? I know for example that with bandpass filters it's the difference between +-3dB of the cutoff ...
4
votes
2answers
262 views

Why is “throughput” called “bandwidth”?

But back in school, I had learned that the "bandwidth" of a communication channel is the frequency of the highest-frequency signal minus that of the lowest-frequency signal that it can carry. Yet in ...
0
votes
2answers
250 views

What is “M” in Hartley's law?

If Hartley's law is: $$ C = 2 B \log_2 M $$ I know this equation is part of calculating the capacity of a channel. I also understand that: \$C\$ is the digital bandwidth, in bits/second \$B\$ is ...
2
votes
1answer
303 views

SPI communication - bits per second vs Hz

I have been reading more and more about bandwidths and frequencies to try to solve the following problem, but I am only ending up more confused. (I have limited electrical/signals background.) I ...
2
votes
2answers
3k views

Signal rate, data rate and bandwidth in digital signals

I'm trying to understand the concept of signal rate and the relation between signal (baud) rate and bandwidth of digital signals from a book about data communication. First, the book distinguishes ...
1
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1answer
743 views

Bandwidth vs sample rate in SDR

In software defined radio (SDR) I often see sample rate and bandwidth interchanged or maybe I'm misunderstanding... If an sdr can sample a 2 MHz wide slice of rf spectrum does that imply it would be ...
1
vote
1answer
98 views

USB Hub bandwidth problem [closed]

I will use a Beaglebone Black with a powered USB Hub to control a USB Microphone (PCM2912A) and a USB HDD. The task consists in recording and writing the Audio directly into the HDD... Will I have ...
0
votes
1answer
99 views

frequency allocation for telecommunication companies

For a high bit rate in data communication we need a high bandwidth. Suppose there are hundreds of carriers in a particular region and they are all allocated microwave frequencies. Minimum spacing ...
1
vote
3answers
347 views

Noise control in op-amp circuit design by using low spec op amps

I have a rather strange problem. I have a breadboard circuit on a double sided PCB with plenty of ground plane and a good well decoupled power supply. I am amplifying a small medium frequency signal ...
4
votes
1answer
316 views

Practical Limit of Feedback Control Systems WRT Bandwidth

In a digital feedback control system, I'm interested in the practical limit of what the correctable bandwidth is. For example, given a very simple system: A sensor can sample a simple X position ...
2
votes
2answers
525 views

Merit and meaning of fractional bandwidth

What is the merit of fractional bandwidth? $$f_{fractional}=\frac{f_{higher}-f_{lower}}{f_{mid}}$$ The same absolute bandwidth will have a smaller fractional bandwidth, if the mid frequency is ...
1
vote
1answer
127 views

Transimpedance amplifier bandwidth

I'm planning to use an Avalanche Photodiode (APD) to perform sequential light sensing - something around 100 readings under a minute. From my calculations this implies a frequency of around 1.67~2Hz. ...
0
votes
1answer
106 views

Using filters to reduce bandwidth of received signal

I am doing some radio work, and I assume you can use a bandpass filter to reduce the bandwidth of a received signal. The application is modifying schematics for a FM broadcast receiver to a 5-25 kHz ...
1
vote
1answer
49 views

Loss of speed on error-free aDSL line [closed]

Is there such a thing as an old telephone line? Does a POTS cable deteriorate over time? I am talking about lines in area where no one lived 75 years ago. Sometimes a customer using an asymmetric DSL ...
-2
votes
1answer
61 views

The bandwidth Ω of a low-pass signal f(t) ↔ F(ω)

I'm not sure about the answers to the two parts of this question: The bandwidth Ω of a low-pass signal f(t) ↔ F(ω) is defined by the constraint: $$ \frac{1}{2\pi } \int_{- \Omega }^{\Omega } ...
1
vote
1answer
61 views

finding out the bandwidth of m(t)*m(t) if the bandwidth of m(t) is a known quantity

m(t)*m(t) in time domain is equivalent to the convolution of m(w) and m(w) in frequency domain.Thus if the bandwidth of m(t) is a known quantity then how is the bandwidth of m(t)*m(t) is determined?
3
votes
2answers
577 views

RF Narrow bandpass filter (crystal ladder)

I am currently designing a narrow band pass filter at around 8Mhz, using the crystals having a resonance frequency of 8Mhz. Using the tutorial from ...
0
votes
0answers
33 views

Optimizing a data link

I am running into trouble trying to optimize a VSAT running at 4096kb/s QPSK modulation. I've found that using a more advanced modulation scheme permits more bits per baud to be transmitted. But ...
0
votes
2answers
114 views

Choosing Oscilloscope with appropriate bandwidth for Jitter analysis

Can someone give me a rule of thumb of choosing Oscilloscope with appropriate bandwidth for the Jitter analysis of clock signals? What device is highly preferable: spectrum analyzers, frequency ...