FIELD: function generators. SUBSTANCE: approximation is calculated using linear and non- linear functions. This results in possibility to use simple approximation function, which is implemented using lesser number of units. Device has adder, unit for calculation of maximum, unit for calculation of square root of difference between constant and square of variable and reference voltage source. Device provides low error of method which is less than 0.3 %. EFFECT: simplified design, decreased device error, high speed. 1 dwg
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