What is the best op-amp for EMG signals?

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SUMMARY

The discussion centers on selecting an operational amplifier (op-amp) for collecting electromyography (EMG) signals, specifically comparing the TL072 and the IC 741. The TL072 is recommended for its lower noise and higher bandwidth compared to the IC 741, which may not meet the necessary performance standards for EMG applications. Additionally, considerations regarding bias currents and compliance with UL 544 Medical Device safety standards are highlighted, suggesting the potential need for FET-based op-amps for optimal performance.

PREREQUISITES
  • Understanding of operational amplifiers and their specifications
  • Knowledge of electromyography (EMG) signal collection techniques
  • Familiarity with UL 544 Medical Device safety standards
  • Basic electronics concepts, including power supply voltage considerations
NEXT STEPS
  • Research the specifications and applications of the TL072 op-amp
  • Explore the characteristics and limitations of the IC 741 op-amp
  • Learn about FET-based op-amps and their advantages for low bias current applications
  • Investigate common-mode range characteristics of various op-amps
USEFUL FOR

Electronics engineers, biomedical engineers, and researchers involved in EMG signal processing and medical device development will benefit from this discussion.

abhiroop_k
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It's impossible to say without knowing something about your requirements. The TL072 will likely be much lower noise than the 741 and it has twice the bandwidth.

The safest thing to do is try to buy a TL072. They are in stock for about a buck a piece.

http://www.mouser.com/Search/ProductDetail.aspx?qs=E2%2FxqS9xjzrrJtzLbEfvqg%3D%3D
 
Last edited by a moderator:
abhiroop_k said:
I am working on a project that involves using an op-amp (among other ic's) to collect EMG signals from arm muscles.

I couldn't get my hands on TL072. Will IC 741 be a decent substitute?

TL072 -> http://www.ti.com/product/tl072

IC 741 -> http://www.ti.com/lit/ds/symlink/lm741.pdf

Thanks in advance.

You may need to use the FET-based opamp in order to keep your bias currents low enough to meet UL 544 Medical Device safety standards.

What power supply voltages are you using? The older opamps like these two don't have very good common-mode range characteristics at their inputs and output (they are not rail-to-rail opamps).
 

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