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Tolerance Analysis

Tolerance Analysis. Identify each of the error sources. Determine the sensitivity of each performance parameter to changes in each error source assuming all other sources are error free.

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Tolerance Analysis

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  1. Tolerance Analysis • Identify each of the error sources. • Determine the sensitivity of each performance parameter to changes in each error source assuming all other sources are error free. • Assuming all error sources are independent of each other, calculate the maximum probable error in each performance parameter. • Add a safety margin before using the results in any specification.

  2. R2 R1 Vi - Vo + 0 Tolerance Analysis (Error Accumulation) Looking at contribution of R1 Or (% change) in gain equals – (% change) in R1

  3. Now, looking at contribution of R2 Or (% change) in gain equals (% change) in R2

  4. Assuming the errors in R1 and R2 are independent of each other: The maximum worst case error in gain will be: But sometimes the independent errors may tend to cancel each other, so the maximum probable error will be:

  5. Example of application: We need to supply an amplifier with a gain of –5 with a max probable error of 2%. To build in a 20% safety margin, we should target for a gain error of: And if we specify the same tolerances for both resistors:

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