Patent ID: 6351181
Filing Date: 2002-02-26
Classification: G06G

Abstract:
An electronic function module comprising a series of sections (C1, C2, . . . , Cj, . . . ) enabling the generation of a second current having a relationship to at least one first current of the type y=xi, where x represents the value of the first current, y represents the value of the second current and i is the order of the section in said series, characterized in that each section Cj comprises:a pseudo-conductance G*j connected between a supply voltage (V*in) and a pseudo-ground (7) and generating an output current (Ij); a control transistor (Tj) passing the output current Ijâˆ’1 of the preceding section Cjâˆ’1 and adapted to control said pseudo-conductance G*j in such a manner that said output current Ij is proportional to the current Ijâˆ’1, of the preceding section Cjâˆ’1; a current conveyor (T3, T5, T6) for passing said output current Ij on the one hand to said control transistor of the following section Cj+1 and on the other hand to an output of the section Cj; and in that the current passing through the control transistor of the first section C1 of said series is a fixed current (I0), such that the output current Ij of any section Cj of the series is proportional to I0j; said series of sections enabling the generation of a second current which has a relationship to a first current of the type y=xk/j, where x represents the value of the first current, y represents the value of the second current and k and j are the orders of the sections Ck and Cj respectively, characterized in that the function module further comprises a closed-loop control circuit (Ti) supplying said supply voltage (V*in) on the basis of an arbitrarily selected input current (Iin) and the output current (Ij) of any section Cj of said series, such that the currents Iin, and I1, are kept equal, so that the output current Ik of a section Ck is such that Ik=Iink/j.