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Interactive Design Tools: Instrumentation Amplifiers : Inamp Error Budget Analysis

A tool for estimating error contributions in Analog Devices instrumentation amplifiers.

Instructions | Troubleshooting
Application Parameters

Differential Amplitude,
mV Common Mode Voltage,
Gain Operating Temperature, TA °C
ohms RS-   ohms

Error SourceSpecificationCalculationEffect on
at Temp.
Effect on

Gain Error %  ppm
Gain Drift, GTC
ppm / °C
GTC * (TA-25) ppm
Gain Nonlinearity %  ppm
Input Offset Voltage, VOSI µV VOSI / VDIFF ppm
Input Offset Voltage Drift, VOSI_TC µV / °C ( VOSI_TC / VDIFF ) * (TA-25) ppm
Output Offset Voltage, VOSO mV VOSO / ( GAIN * VDIFF ) ppm
Output Offset Voltage Drift, VOSO_TC µV / °C ( VOSO_TC / ( GAIN * VDIFF ) ) * (TA-25) ppm

Bias Current, IB
- Source Imbalance Error
nA IB * (RS+ - RS- ) / VDIFF   ppm
Bias Current Drift, IB_TC
- Source Imbalance Drift
pA / °C IB_TC * (RS+ - RS- ) * (TA-25) / VDIFF ppm
Offset Current, IOS
- Source Resistance + Imbalance Error
nA IOS * MAX( RS+, RS- ) / VDIFF ppm
Offset Current Drift, IOS_TC
- Source Resistance + Imbalance Drift
pA / °C IOS_TC * MAX( RS+, RS- ) *
(TA-25) / VDIFF

Common Mode Rejection, CMRR dB VCM / ( 10CMRR/20 * VDIFF )   ppm
Noise, RTI (0.1 Hz - 10 Hz) µV p-p  ppm   

TOTALS   ppm


Enter application data in the topmost section of this form, under "Application Parameters".

Tabbing to or clicking on a new field recalculates the page. If a field is left blank you may see NaN (Not a Number), which means that insufficient data was entered to compute that value.

Device specifications should be pre-entered under the "Specification" column and each specification's individual contribution to accuracy and resolution will appear in the gray area at right. Gray area fields are output-only and cannot be changed. At the bottom of this form, error contributions are totaled.

Please note that specs shown are worst-case for the selected part, if available, otherwise typical values are used. If no spec is available, a best-case number (usually zero) is substituted. It is highly unlikely that all worst-case specs would ever be present at the same time in the same part. The designer should always refer to the appropriate datasheet and substitute numbers most appropriate to his/her application. All calculations are approximations with errors displayed and summed in absolute PPM, even though in some scenarios the actual values would be negative.

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No special issues are known to exist with this calculator at this time.

For further troubleshooting information, please visit our Interactive Tools troubleshooting page.

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