1. A method, comprising: creating a computer readable design for an electronic circuit by performing the following on a computer: generating an optimization problem based on a family of equations that describe the circuit's operation, where, when the family of equations are expressed in standard form they comprise a posynomial function f having an e x term where said e x term corresponds to the introduction to said family of equations of an approximation, said generating of said optimization problem including introducing numerical constraints; and, solving the optimization problem to produce a set of numerical values for said circuit's design parameters.