In a capacitive sensor of the type having X electrodes which are driven and Y electrodes that are used as sense channels connected to charge measurement capacitors, signal measurements are made conventionally by driving the X electrodes to transfer successive packets of charge to the charge measurement capacitors. The method and system model a network as a directed graph. In addition, the aforementioned data refreshes can be manually invoked at any time. A scan direction not perpendicular to the direction of movement of a target provides for improved die-to-die comparisons. The optical clock pulse generator generates an optical clock signal with half the frequency of the input optical pulse whose phase matches with that of the optical signal at the optical regenerator. The semiconductor device includes first and second semiconductor dies, a first isolating block positioned on the first semiconductor die, and a second isolating block positioned on the second semiconductor die.