A voltage mode integer divider for fast A/D Conversion

An analog circuit capable of implementing an integer division by a constant number is presented in this paper. The quotient and the residue of the division are generated concurrently by a circuit operating in voltage mode that can be used in various A/D Conversion (ADC) architectures like subrange ADCs as well as signal processing units, neural networks, fuzzy controllers etc. A comparison with an integer divider that was implemented in current mode by the authors shows that the voltage mode implementation leads to higher speed operation due to a better equalization of the quotient and residue path delays of the divider. A fast, low area and power 8-bit subrange ADC that has been designed based on the voltage mode integer division architecture is presented as a case study. The comparison of this 8-bit subrange ADC with other similar resolution ADCs shows the advantages of the proposed integer division architecture.