Signal-Noise Ratio: Decibels & Resolving Signals

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Discussion Overview

The discussion revolves around understanding the implications of signal-to-noise ratio (SNR) measured in decibels (dB), particularly in the context of an integrated circuit designed to read magnetic fields. Participants explore the adequacy of a 20 dB SNR for resolving signals and the conditions under which signals can be detected even with lower SNR values.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses concern about whether a 20 dB SNR is sufficient to resolve the signal.
  • Another participant suggests that 20 dB could be considered excellent, depending on the context of the application, and notes that GPS receivers operate below the thermal noise floor.
  • A participant specifies that the SNR pertains to an integrated circuit measuring magnetic fields and mentions the calculation of noise as white noise.
  • It is noted that signals with a 20 dB SNR can typically be resolved easily, and that methods exist to detect signals with an SNR below 0 dB, referencing GPS technology.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the implications of a 20 dB SNR, as there are differing views on what constitutes a "good" SNR depending on the application context. Some participants argue that 20 dB is sufficient, while others highlight the need for additional context to assess its adequacy.

Contextual Notes

The discussion lacks specific details about the integrated circuit's operational environment and the nature of the signals being measured, which may affect the interpretation of the SNR value.

dmorris619
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I am trying to get an understanding of what a good signal to noise ratio in terms of decibels. My SNR is roughly 20 dB, and am concerned about being able to resolve the signal from this.
 
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You need to provide a context--what is your system, application, apparatus, etc.--to get a useful answer. In general, however, 20 dB (a 100:1 ratio of signal power to noise power) could be considered excellent, even luxurious. (Consider that GPS receivers operate on a signal that is below the thermal noise floor).
 
Its for an integrated circuit that reads the magnetic field. I am calculating the noise generated by the device which is essentially white noise.
 
Information can very easily be resolved from a signal with SNR of 20dB and rarely does one have such luck to work with such signals.

The lowest detectable signal is often said to be when the signal power is equal to the noise power or the SNR is 0dB. There are of course methods of observing a signal will less than 0dB such as those used in GPS receivers like mentioned above.
 

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