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A method is introduced for finding non-linear functions digitally. The design is based on voltage-to-frequency conversion (VFC) and decimal rate multiplication (DRM). A DC signal is applied to the VFC and analogue comparator, producing a digital number proportional to the square of the input voltage. For the second half-period, this digital number is applied together with the VFC output clock frequency to the DRM, producing a digital number proportional to the cubic and fourth powers of the input DC signal. Any of the three digital numbers can be selected and displayed.

This paper introduces a method for measuring temperature radiation digitally using Q non-linear analogue to digital converter (NLADC). A voltage proportional to the temperature is applied to an NLADC which produces a digital number proportional to the fourth power of the applied voltage.

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