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Common Mode Rejection Error Estimate

Online common mode rejection error estimate. CMRR treated as an amplitude ratio at the relevant frequency.

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common mode rejection error calculator online

Use common mode rejection error estimate online for common mode V, cmrr dB. CMRR treated as an amplitude ratio at the relevant frequency. Ideal nominal component model. Verify topology, operating range, tolerances and ratings against the actual component datasheet.

How to use it

Enter common mode V. Set cmrr dB. Select Calculate and check the labeled output. Copy or download the JSON result.

Options and example settings

OptionChoices / valueExample default
common mode VMain input. Signed finite values. 2
cmrr dBOption. Signed finite values. 80

Calculation method

input_referred_error_V = common_mode_V/10^(cmrr_dB/20) (^ means exponentiation; trig functions ending in d use degrees).

Worked examples

Apply common mode rejection error estimate to the case below, keeping the displayed units and assumptions. CMRR treated as an amplitude ratio at the relevant frequency.

Common Mode Rejection Error Estimate — worked case

Settings: cmrr dB: 80

Input:

2

Calculated result for these inputs:

Output:

{
  "input_referred_error_V": 0.0002
}

Choose the right tool

Match the topology before entering values: series and parallel networks, inverting and noninverting stages, and buck and boost converters use different equations. Component ratings, parasitics, protection and measured conditions require separate review.

Limitations and common mistakes

  • CMRR treated as an amplitude ratio at the relevant frequency. Ideal nominal component model. Verify topology, operating range, tolerances and ratings against the actual component datasheet.
  • Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.

Frequently asked questions

How can I use common mode rejection error calculator online?

Enter common mode V. Set cmrr dB. Select Calculate and check the labeled output. Copy or download the JSON result.

Technical references

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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