ANALOG TO DIGITAL CONVERTER

摘要

An analog error signal is received from a machine tool position sensor. Its magnitude is sensed by a comparator circuit including an operational amplifier and a digital output level is generated when a particular analog voltage level is sensed. The digital output level resets the position sensor to restore the analog output signal and the comparator circuit to their initial state. A reset circuit, including two monostable circuits, generate a delayed reset pulse to the input of the comparator to reset its output if the analog input signal fails to do so. Forward and reverse directional circuits including NAND logic gates are connected together in parallel to the comparator output and conditioned by forward and reverse reference signals to convey the digital output from the comparator when the machine is moving in the direction to which the comparator has been preconditioned.