Solver for component values in the E-series
In analog circuit design, calculating component values is not straight-forward because they are quantized into what known as 'E-series'. Criteri-R is a tool that helps finding out such component values that comply to various user criteria.
Instead of equations, inequality pairs are input as criteria for determining whether the mathematical outcome of certain quantities based on a set of component values be acceptable and hence a solution found. Every combination of component values in the E-series is tested to see if it is a solution. Solving processes are accelerated with proprietary optimizations. Users may limit the criteria to control the physical tolerances as best as they wish.
In Criteri-R, you define named components for use in mathematical expressions. You define criteria in mathematical terms for controlling the acceptance of your physical quantity values. You may also define functions to help simplifying mathematical expressions.
In case some components possess non-zero tolerance, each (primary) combination of component values further evolves into a secondary combinations of values due to the 2 toleranced values of every component. Only if all these secondary combinations lead to results fulfilling all inequalities, will that primary combination be deemed a solution. This feature is termed Extreme Values Analysis.
*** Caution ***
Criteri-R does NOT guarantee the minimum and maximum values of the quantity of any criterion always happen at these extreme value combinations. There is always possibility that a local minima or maxima occurs in the middle of the two extremes of a toleranced component value, though it is rarely the case. Nevertheless, the analysis helps to sort out the potential solutions for further investigation if necessary.
There is a free version of Criteri-R, but with a limited number of features.