ANALOG-DIGITAL AND DIGITAL-TO-ANALOG CONVERTERS AND METHODS FOR CONVERTING AN ANALOGUE SIGNAL TO A NON-BINARY DIGITAL WORD AND A NON-BINARY DIGITAL WORD TO AN ANALOG SIGNAL

摘要

P METHOD AND APPARATUS FOR CONVERTING CORRESPONDING DIGITAL SIGNAL ANALOGS, AND VICE VERSA, THAT ARE ACCURATE IN RELATION TO THE REAL INPUT VALUE AND NOT IN RELATION TO THE HIGHER VALUE OF THE ANALOGUE INPUT SIGNAL. / P P CONVERSION IS CARRIED OUT BY MEANS OF A PLURALITY OF CYCLES WHOSE NUMBER IS EQUAL TO THE NUMBER OF BITS OF THE DIGITAL OUTPUT WORD OR DIGITAL INPUT WORD; FOR EACH CYCLE A COMPARISON VOLTAGE IS TESTED TO DETERMINE WHETHER THE OUTPUT BIT OR THE INPUT BIT FOR THE CYCLE IS HIGH OR LOW; THE COMPARISON VOLTAGE IS THE AMPLIFIED DIFFERENCE OF THE COMPARISON VOLTAGE FOR THE PREVIOUS CYCLE AND A REFERENCE SIGNAL; AND THE SCALING FACTOR FOR AMPLIFYING THE DIFFERENCE BETWEEN THE TWO SIGNALS IS OF A FIRST VALUE IF THE PREVIOUS CYCLE BIT WAS HIGH AND A SECOND VALUE IF THE PREVIOUS CYCLE BIT WAS LOW. This invention is applicable to fuel injection systems for automobiles.