Michael Rigby-Jones wrote:
>   
>> -----Original Message-----
>>
>>     
>> yes. That's true. Differential error is a lot less than absolute
>>     
> error.
>   
>> It's inherent in manufacturing process.
>>     
>
> Not always true, we used a resistor array in a high precision
> differential amp circuit some years back because we needed very close
> matching over a wide temperature range.  We found the common or garden
> resistor arrays used for e.g. terminating busses weren't very good for
> this at all.  We sourced a high precision part ($$) in the end that gave
> us the required performance.
>
> Mike
>   
Agreed, but such a resistor array is better than separate resistors.

I would not hazard though as to how much better.
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