Questions tagged [noise-spectral-density]
Anything related to the noise spectral density, i.e. the function representing how the power of the noise signal is distributed among its frequency components.
108 questions
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Flicker Noise and Phase Noise [duplicate]
In the formula above , it is given that jitter due to flicker noise = n x timining variation / t since n/t = 1/f , shudnt the formula be timing variation / f then instead of timing variation * t (...
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1 vote
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Does this RF white noise signal look correct?
I experimented with a simple RF white noise generator using avalanche breakdown on an NPN BFR93A transistor. I've used a voltmeter and an ammeter to determine the breakdown voltage and associated ...
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1 answer
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Understanding noise in analog circuit
I have been wondering in this analog circuit when we try to find out the input referred noise, how I went about is, I first found out the output referred noise power spectral density. I modelled a ...
2 votes
2 answers
134 views
Opamp noise analysis corner frequencies calculation
I am learning about opamp noise calculation in this document.You can see calculation example:1 in page no:7. Below equations are used for calculating the corner frequencies. The calculation are given ...
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4 votes
2 answers
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White Noise Equivalent Bandwidth (NEB)
This question is regarding White Noise Equivalent Bandwidth (NEB).I was going through this material from Renesas . The definition of NEB is given as when running white noise through a first order low-...
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1 vote
1 answer
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Why opamp noise gain is referred to non inverting input
I was learning about noise analysis of opamp with the help of this document.It says that for Noise Gain In op-amp circuits, noise is commonly assigned to the non-inverting op-amp input. But no ...
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-1 votes
1 answer
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I want to design a ultra stable low noise current source for a generalized application [closed]
Which technology nodes have the best low noise output comparing the technology and to find out the best possible architecture and topology which fits both consideration? Some technology comparison ...
0 votes
1 answer
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A-Weighted Noise Power Calculation
Can anyone please show me how to calculate the A-weighted noise power of a noise source. Consider the case of a resistor having a spectral density of 4kTR. What is the A-weighted noise power of this ...
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2 votes
3 answers
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Noise density in 1/f region
The datasheet of the ADR1000 voltage reference specifies the 1/f noise density as 30nV/sqrt(Hz) at 10Hz and 300nV/sqrt(Hz) at 0.1Hz. Given that this is the 1/f region of the voltage reference, how can ...
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Noises are measured over a bandwidth. Is 50Hz and 900Hz noise the same at 1kHz bandwidth? [closed]
They say noise is over a bandwidth. At a bandwidth of 1000Hz. Is the noise at 50Hz and 900Hz similar? If yes. Please made a quick drawing how the noise at 50Hz and 900Hz look like roughly so I can ...
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1 vote
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Impact of laser current source noise on RIN (relative intensity noise)
I am trying to specify the noise requirements for a constant-current source that would drive a diode laser with a certain relative intensity noise PSD. Lasers typically behave as forward-biased ...
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4 votes
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How to properly compute noise power spectral density?
I am confused about two different definitions of Power Spectral Density (PSD) that I have seen online. The first comes from the National Instruments LabVIEW documentation (1): $$ PSD = \frac{PS}{\...
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3 votes
1 answer
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Noise Figure in LTSpice
I'm simulating an LNA from a paper. It's using HBT BiCMOS technology an one of the things the paper shows is the simulation of NF in range of 3GHz to 10GHz. I'm trying to replicate the simulation with ...
1 vote
2 answers
677 views
Noise scaling in a current source
I have a bunch of constant current sources in my lab: some are laser diode drivers and some are DC power supply units that have a constant current mode. I've known from prior experience that some of ...
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2 votes
1 answer
609 views
Low noise virtual ground, voltage reference or LDO + op amp?
I'm doing some sensitive signal measurements in 1~10kHz range where I amplify and filter (multiple active stages) a small voltage signal by hundreds ~ thousands of times and then sample it. A negative,...
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