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This paper deals with the design and simulations of a 4-bit flash analog-to-digital asynchronous converter designed in 0.35 mum CMOS technology. The input voltage signals of a range of 1.6 V are converted to binary numbers based on flash method. Analog part of the project, which is made using full-custom technique, contains 17 comparators. The two extra comparators indicate when input signal is out of the conversion range. The digital part contains a decoder, which converts comparators outputs logic states into binary numbers and extra codes to indicate underflow, overflow or other conversion errors.