1. A multilayer feed-forward neural network of component neurons, comprising: a plurality of processing elements, each corresponding to a respective one of the component neurons of said multilayer feed-forward neural network, said plurality of processing elements being connected to form a systolic pipelined array, each processing element comprising MOS analog circuitry for receiving input voltages and outputting at least one voltage signal, said MOS analog circuitry comprising a plurality of multipliers for calculating at least one sum of a product.