Rapid, accurate A=D converter - has error correction circuit using code differences to correct code by successive approximations

摘要

The analogue-digital converter has a conversion circuit which compares an analogue voltage with a displayed code. The code being represented by the elements of a register (5). The analogue voltage being applied to the second input of a comparator (3). The analogue voltage supplied to the comparator (3) second input is also applied to an input of a multiplexor circuit (1). The multiplexor (1) input is selected once in two times under the control of a logic circuit. The converter has an error correction arithmetic circuit (8) which supplies under the control of the logic circuit (4), a corrected code from the displayed codes obtained at the registers (5) output. This corrected code is provided firstly when whatever input of the multiplexor input (1) circuit has been selected. Then when the input connected to the output of the conversion circuit has been selected. The error correction arithmetic circuit corrects the first code using the difference between the first and second codes obtained.