Patent ID: 7936243

Claim:
An adjustable resistor comprising: a first electrode, arranged on one layer of a multi-layered substrate; a second electrode, arranged on the same layer of the substrate as the first electrode and separated apart from the first electrode in a predetermined distance; a planar resistor block, electrically connected between the first electrode and the second electrode, the planar resistor block having a plurality of terminals serially connected, exhibiting a main resistance and a plurality of inner resistances corresponding to the terminals respectively; and a plurality of connecting lines, extending from the second electrode to the terminals of the planar resistor block respectively, wherein the connecting lines are selectively broken by a process for drilling at least one of the connecting lines to form a number of series and parallel connection combinations of opened connecting lines such that the resistance value of the planar resistor block is precisely adjusted and is equivalent to the main resistance plus an equivalent resistance of selected terminals.