Shadders
Newbie level 5
Hi,
I am looking to match resistors with a very high degree of accuracy/tolerance.
One can purchase 0.01% resistors quite easily, but with regards to a project such as an R-2R ladder DAC, which has 24bit depth, then the accuracy/tolerance would have to be 0.000005%.
Since such a tolerance is not available, then the next option is to match resistors using a Wheatstone bridge.
What i am not sure of is whether it is possible to achieve the matching to such tolerance, or if there is another method of achieving the accuracy such as paralleling the resistors (0.01% + trim) to match the target resistance. This would require a fair amount of physical testing to trim the resistor to match the selected target.
Is this method doomed to fail, or are there better alternative methods ?
Thanks and regards,
Shadders
I am looking to match resistors with a very high degree of accuracy/tolerance.
One can purchase 0.01% resistors quite easily, but with regards to a project such as an R-2R ladder DAC, which has 24bit depth, then the accuracy/tolerance would have to be 0.000005%.
Since such a tolerance is not available, then the next option is to match resistors using a Wheatstone bridge.
What i am not sure of is whether it is possible to achieve the matching to such tolerance, or if there is another method of achieving the accuracy such as paralleling the resistors (0.01% + trim) to match the target resistance. This would require a fair amount of physical testing to trim the resistor to match the selected target.
Is this method doomed to fail, or are there better alternative methods ?
Thanks and regards,
Shadders