Questions tagged [attenuation]

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3answers
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Demodulation/filtering of a binary signal

I'm simulating an amplitude modulation system on Matlab and have got to filtering the demodulated system. The original data to be sent was a 1x100 set of binary data. Which was then applied to a ...
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2answers
37 views

Difference Amplifier - Signal Attenuation

I am planning on using a difference amplifier IC much like the AD8206 to measure the differential voltage across a high side shunt in order to monitor the current. I chose a differential amplifier ...
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1answer
89 views

Is there a way to measure or predict how much a 10.5 microns Aluminum foil attenuates EMF radiation? [closed]

Is there a way to measure or predict how much a 10.5 microns Aluminum foil attenuates EMF radiation? And at what frequencies? Is it enough to use as Faraday shield?
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2answers
144 views

Active filter has unintended attenuation for lower frequencies

I have design an active filter with an online tool. The circuit looks as follows: It should be a low pass filter of 3rd order with a cut-off frequency at 50kHz. Unfortunately, it attenuatues DC ...
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1answer
112 views

FR-4 RF attenuation (when used as an enclosure)

I want to use a blank PCB (no copper) as a panel of an enclosure because it seems to be the cheapest way (Seeedstudio et al.) to have custom holes and cutouts. I wonder if antennas placed behind such ...
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2answers
113 views

radar attenuation calculations

I would like to ask a few questions that are probably not difficult for engineers to figure out. Personally, I am not an engineer but want to learn about radars. I am having trouble understanding the ...
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0answers
22 views

I don't know why my attenuation setting changed

I have a question about the change in my attenuation setting. I have a spectrum analyzer. In one measurement the main harmonic is measured to be 342.28 mV and its reference level is 355 mV. The ...
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1answer
110 views

How to calculate cutoff freqeuncy of Bandpass filter, given an attenuation dB level (OTHER THAN -3DB)

I know that -3dB is the accepted standard, where the power of the signal is at 50%, and that upper and lower cutoff frequencies are calculated with regards to this value, and there are simple formulas ...
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2answers
462 views

Purpose of attenuation before op-amp input

What is the purpose of putting attenuation circuit before op-amp input? I cant find the actual reason for this topology. Is there any reason behind it? Why we need to attenuate the incoming signal but ...
1
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0answers
29 views

Signal Attenuation TVS and series resistor

This question is in regards to signal attenuation on high speed data lines like RS-485 (and any others as well). I'm new to the signal world, so please bear with me here. Are there some useful ...
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2answers
80 views

Effect of wall location for guided wave attenuation

Pardon my ignorance here if this has already been answered. I'm not fully familiar with the English terminology here so my searches came up empty. If there is any keyword I’m missing or I’m not using ...
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1answer
39 views

LTSpice transient analysis and current amplification problem

Im simulating LC circuit in LTSpice: It's tuned at resonance at 1 MHz in the transient response simulation plotting the source and R1 current. Both of which are equal in amplitude 600mA but with a ...
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1answer
52 views

How to interpret the vertical axis of this attenuation plot?

How can I interpret the following curve for this toroidal ferrite? It shows the attenuation vs frequency. But the vertical axis is not dB, it is impedance in Ohm. This is unusual for me. How can I ...
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5answers
2k views

Running baseband analog audio signal over cat 5 cable [closed]

What will happen to a single ended (not differential) 1Vpp analog audio signal(4khz bandwidth, not modulated) if it runs through long cat5 cable (length can be 50 meters)? How much signal voltage can ...
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1answer
39 views

Difference two attenuation constant

When finding parameters for electromagnetic waves and transmission lines, we can find various characteristics including attenuation and characteristic impedance. \$\alpha\$ is attenuation constant. 1-...
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1answer
196 views

Best way to attenuate R2R DAC output?

Given an N-bit R2R DAC, with input voltages of e.g. 0-3.3 volts, what is the the best way (signal integrity and quality maintained) to attenuate its output voltage to a range e.g. 0-.7 volts for a VGA ...
1
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1answer
112 views

What is rapid signal attenuation?

Attenuation describes the weakening of the signal as it travels from the transmitter to the receiver. However, this textbook describes a concept called "rapid signal attenuation" as a way to allow ...
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1answer
1k views

Why is an oscilloscope's Attenuation switch placed on the probe?

I'm wondering why an oscilloscope's Attenuation switch is placed on the probe not on the oscilloscope's body (like the AC/DC Coupling switch that's placed on the scope body not on the probe)?