In the book of "The Art of Electronics", Chapter 7, on page 422 one can see the following schematic diagram and read this commentary:
"Even though one side of R5 is connected to ground, it would be unwise to use a single-ended amplifier, since connection resistances of a milliohm would contribute 10% error! A differential amplifier is obviously required, but it need not have particularly good CMRR, since only very small common-mode signals are expected."
So my question is: Which connections' resistances(segments of wiring) are exactly meant by authors?
Thanks in advance to all who could be of any help to understand this.
View attachment 41437
"Even though one side of R5 is connected to ground, it would be unwise to use a single-ended amplifier, since connection resistances of a milliohm would contribute 10% error! A differential amplifier is obviously required, but it need not have particularly good CMRR, since only very small common-mode signals are expected."
So my question is: Which connections' resistances(segments of wiring) are exactly meant by authors?
Thanks in advance to all who could be of any help to understand this.
View attachment 41437
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