In "parts properties" for lumped element inductors and capacitors,
it would be better to list "ESR" instead of "Q". "ESR" is the more
fundamental property (since Q=XC/ESR or Q=XL/ESR) and would
not have to be changed as often as "Q" during tuning.
it would be better to list "ESR" instead of "Q". "ESR" is the more
fundamental property (since Q=XC/ESR or Q=XL/ESR) and would
not have to be changed as often as "Q" during tuning.
I think that as you tune an object's value the ESR tends to change whereas the Q is more "constant". For a given component, throughout the frequency range, of course, the Q will vary whereas the ESR will stay constant.
If you just write a simple equation relating Q and ESR and make the ESR a variable you can tune the ESR to your heart's content.
Better yet, make the Q a function of the part value using known parts (such as a specific coil range) and then you don't have to fuss with the ESR/Q at all while tuning.
Take a look at the doc on writing equations for more info.
Mark Zachmann