Abstract
The product of the signal propagation delay times the average power dissipation has been used as a figure of merit for digital systems in much the same way as the gain times bandwidth product has been used to evaluate and compare devices intended for linear circuit applications. In this paper it is shown that for simple logic systems, the delay × power product can be expressed in the form W = KΔV V cc C T , where C T is the total circuit capacitance, V cc is the power supply voltage, ΔV is the magnitude of the signal voltage transitions, and K is a constant which is usually determined by the circuit configuration but may depend on the pulse repetition frequency. Some simple logic systems are compared using this figure of merit and the results are discussed.
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