A new circuit approach for realizing analogue synthesizers of a wide range of special functions is proposed. The proposed technique is based on approximating a special function using exponential approximations. The circuit is flexible and can be programmed to produce a wide range of special functions with reasonable accuracy. The proposed circuit uses transistors, resistors, switches and current sources and is suitable for integration. Simulation results obtained from the synthesis of the error function erf(x), the sine integral Si(x), the sinh integral Shi(x), the integrals of the Struve function , and the modified Struve function , are presented.

A new current-mode analog circuit configuration that implements the function exp(x - y) is proposed. The circuit uses bipolar junction transistors and resistors and is suitable for integration. Using the proposed circuit, implementation of the functions sinh(x - y) and cosh(x -y) is straightforward. Simulation results are included.

Summary A new current-mode analog circuit configuration tha t implements the function exp(x - y) is proposed. The circuit uses bipolar junction t ransistors and resistors and is suitable for integration. Using the proposed circui t, implementation of the functions sinh(x - y) and cosh(x -y) is straightforward. Simu lation results are included.