RTI and RTO Errors

 

For a signal chain (example above) you can refer the errors from each block either to the Input (vs) or the Output (vo3). There's advantages to both!

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OFFSET RTI VS RTO

How do the Offset Errors from each circuit block impact the system spec? Typically, you’ve got two choices of where to scale the errors.

• RTI – Referred to Input
• RTO – Referred to Output

RTI Advantage:

• Easier to compare the error to the input source level.
• Example: for a load cell sensor (vs = 100mV Full Scale), you know that a 1mV error is 1% of full scale.

RTO Advantage:

• Easier to test and verify.
• Example: for an ADC final block (Vo3 = 1023 Full Scale, 10-bits), you can verify a 1% offset by checking for error readings <10 LSBs.

In this series we'll typcailly analyze the Offset Errors as RTI.

 

GAIN RTI VS RTO

The Gain Error does not require any referencing as RTI or RTO.

Why? Because Gain Errors as ratios are Multiplicative, the errors have the same impact at any other location in the chain. (Learn more.. coming soon!)

 

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