ANALOG-TO-DIGITAL CONVERSION DEVICE Russian patent published in 1994 - IPC

FIELD: computer engineering. SUBSTANCE: device having sequential approximation register, two-matrix code-to-voltage converter, selector switches, two comparators, OR gate, pulse generator, positive reference-voltage generator, delay element, AND gate, first flip flop is provided in addition with second and third flip-flops, two NOT gates, second OR gate, six AND gates, second delay element, resistive divider, four reference-voltage sources, electronic switch. Measured voltage-to-code conversion is effected in reduced conversion cycle. END-OF-CONVERSION signal is shaped at the moment when difference between measured and compensating voltages becomes lower than less significant bit value. Sequential approximation register shapes m-bit code. When difference between measured and compensated voltages at the last conversion step is higher than less significant bit value, compensating voltages of U_comp ± U_lsb are generated at check step. When difference between measured and compensated voltages is lower than double value of less significant bit, m-1 bit code is generated in sequential approximation register, otherwise failure signal is shaped. To compensate for error appearing in enabling more significant bit, (m+1) resistors 2R of R-2R resistive matrices in device are connected through switch and voltage divider to positive reference-voltage source. EFFECT: improved validity and speed of check, higher reliability of device. 1 dwg