Method and circuit for perturbing removable singularities in coupled translinear loops

摘要

A translinear network ( 34 ) has first (Q₁, Q₂, Q₃, Q₄) and second (Q₄, Q₃, Q₅, Q₆) translinear loops. A Trafton-Hastings clamp circuit ( 36 ) is connected to generate a piecewise-polynomial-continuous current I_Y, the value of which becomes undefined when current I_X=0 due to a removable singularity in the transfer equation at this point. A current mirror ( 38 ) comprising a plurality of transistors (M₁, M₂, M₃) is coupled to the Trafton-Hastings clamp circuit ( 36 ), and operates to add additional currents in transistors Q₃ and Q₅ to I_X, when the Trafton-Hastings clamp transistor (Q₇) conducts, so as to perturb the removable singularity in the transfer equation into the left half-plane.