Questions tagged [noisefloor]

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1answer
44 views

Amplifying noise floor

Let's say you have -120Db noise floor on an amplifier circuit. You feed this noise into an ideal noiseless amplifier with an Av=25. What is the new noise floor? Proper equation?
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1answer
64 views

How to derive receiver noise figure/input noise floor

When calculating the noise figure for a receiver, assuming the IF bandwidth is narrower than the input RF bandwidth, do you use the narrower IF bandwidth to derive the receiver noise figure? Also, ...
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1answer
65 views

Noise when Charger Connected [closed]

I have a handheld rechargeable Measuring Instrument. When I use it normally, without charger connected, readings on screen are stable. But when I connect the charger into it (It's a 5V USB charger) ...
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1answer
953 views

calculating the RMS noise of an accelerometer

I would like to measure the noise density (microg/sqrt(Hz)) of an accelerometer and then compare the measured one with the typical value in the datasheet. I know the sensitivity and the sampling ...
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1answer
52 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 ...
1
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1answer
91 views

Noise vs Signal

All, I have created a photo-diode amplifier(2 stage) which allows me to set a gain from 2 to 551 (v/v) [4.6 to ~55dB] in 64 steps. The gain is achieved using pre-calculated resistance to provide non-...
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2answers
190 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 ...
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1answer
5k views

How to calculate RMS of total noise from digital Oscilloscope (FFT)?

Only the red channel is in consideration. The yellow curve is not relevant, which is only another channel of the oscilloscope. The image above was captured from a digital oscilloscope. The vertical ...
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4answers
2k views

Very low noise high pass filter design

We are trying to design a high pass filter, which mainly goals are: very low noise. Low noise is the first concern. suppresses 1kHz by around 50dB and passes 2kHz. Gets rid of DC Dont care on other ...
10
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1answer
374 views

How to design a 1-500MHz sine wave level detector to -90dBm?

I want to build a sine wave level detector that works for a single 1-500MHz sine wave in the range of -40dBm to -90dBm. This is a hobby project - so cost is not a big obstacle :-), but I want to stay ...