IEE Proceedings E - Computers and Digital Techniques

The checking of geometrical constraints on integrated-circuit layouts is notoriously slow and costly when carried out purely by software. This paper introduces a new approach, in which layers are converted into digitised pictorial form and processed by simple hardware operating like a computer peripheral. This hardware reports to the computer all cases where constraints may be violated, and these ... View full abstract»

The fast Fourier transform (f.f.t.) has found wide applications in areas requiring the processing of uniformly sampled signals. This paper investigates the characteristics of using a standard, inexpensive micro-computer system to implement an f.f.t. processor operating in either real-time or online mode. Various aspects on the maximum sampling rate in either mode of operation, such as the limitati... View full abstract»

A procedure is described which can be used to design digital differentiators satisfying prescribed specifications. The procedure is based on the Fourier-series method for the design of nonrecursive digital filters, and uses the Kaiser window function for the minimisation of the amplitude of Gibbs oscillations. The approach is used to design a number of differentiators assuming various prescribed b... View full abstract»

A technique is described for the optimal synthesis of n-variable combinational logic circuits with Multiplexer universal logic modules, which may readily be implemented without excessive computer storage requirements. The method requires knowledge of the Rademacher-Walsh spectrum, which is an alternative representation of the truthtable vector of the function being considered. It makes use of a pr... View full abstract»