Design of a neural network-based digital multiplier

The successful design of computational systems is often predicated on the realization of fast multiplication in digital or analog hardware. A key design issue is the tradeoff between speed, complexity, and chip area. With this in mind, an innovative fast neural network-based digital multiplier has been designed, trained, and implemented in VLSI using 1 micron double polysilicon CMOS technology. The design is constructed of modules consisting of three basic neural network components: a 2/spl times/2 adder, a 2/spl times/2 multiplier, and a 3/spl times/2-bit adder. The modular approach allows scalability of the multiplier circuit. The neural network circuitry is based on neuMOS transistors. A neuMOS transistor is a metal oxide semiconductor device with several fixed gates (inputs) and a floating gate. The capacitances between the fixed gates and the floating gate constitute the neural network weights. A comparison of speed in terms of gate delays and neuron delays, shows that the neural network-based multiplier was 2 to 3 orders of magnitude faster than the Wallace Tree and ROM-based digital multipliers.