A new current-mode CMOS analog programmable arbitrary nonlinear function synthesizer

A CMOS current-mode analog function synthesizer is presented. The proposed circuit assumes that the required nonlinear function can be approximated by a seventh-order Taylor series expansion. Each term of the Taylor series expansion is realized using a current-mode basic building block and the output weighted currents of these basic building blocks are algebraically added in addition to a DC current, if needed. The proposed circuit can be easily integrated, extended to include higher order terms of the Taylor series and programmed to generate arbitrary nonlinear functions. PSPICE simulation results demonstrating the functionality of the proposed circuit are included.