Part 4. Classical Frequency-to-Digital Conversion Methods

Abstract. The following classical frequency-to-digital conversion methods are discussed in this part: standard counting method, indirect counting method, combined method and interpolation method. Metrological performances (quantization error and other components of conversion error, conversion time, frequency range) for each of methods as well as advantages, disadvantages and measures how to reduce the quantization error are outlined. It is shown that the use of weight functions can improve metrological characteristics. At the end of the 4th part two classical methods for phase shift-to-digital conversion are described: the method of average phase shift and method of instantaneous phase shift conversion.               

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