Equivalent bits – a question from LinkedIn Group

“I was looking through ELMG’s tutorial “Three Key Issues to Watch out for in the Digital Control of Power Electronics” (http://www.elmgdigitalpower.com/power-electronics-digital-control-free-report-on-three-key-issues/) and am having some trouble understanding the relationship between frequency, register size, and equivalent bits.

An example given in the “2. Timer Precision” section of the document reads:

‘Consider the case where the timer clock runs at 40MHz. If the variable period oscillator register has 256 bits then the maximum frequency that the VPO can make is 10MHz and the minimum is 39.0625kHz. The example LLC resonant power converter needs a variable frequency of 500kHz to 210kHz to perform the control. This means the VPO count register has a usable range from 80 to 191. This is 111 counts which is 6.8 equivalent bits or almost seven bits.”

Equivalent bits are a great way to look at numeric precision.

Come join the discussion to see how equivalent bits is calculated.  https://www.linkedin.com/groups/6677852/6677852-6242781250545942530