Patent ID: 7876119

Claim:
A method of inspecting semiconductor device chip patterns on a wafer, the method comprising: providing on a wafer, in an orderly layout, a plurality of identical chip patterns, each chip pattern including a transistor element, a DC bias application pad, a radio frequency input pad, a radio frequency output pad, and a grounding pad, and a plurality of check patterns identical in shape and size to the chip patterns, the check patterns being arranged within the orderly layout of the chip patterns, each check pattern including pads arranged within the check pattern in the same arrangement as the DC bias application pad, the radio frequency input pad, the radio frequency output pad, and the grounding pad of the chip patterns, and further including a transmission line connecting the radio frequency input pad to the radio frequency output pad; inspecting at least one of the check patterns by applying radio frequency probes of a radio frequency probe head to the radio frequency input pad and the radio frequency output pad, and applying DC probes of a DC probe card to the DC bias application pad and the grounding pad, and applying electrical signals to the radio frequency probes and the DC probes to inspect the check pattern; and determining whether results of inspecting the at least one of the check patterns are within predetermined ranges, and, if the results are within the predetermined ranges, inspecting at least one of the chip patterns by applying the radio frequency probes to the radio frequency input pad and the radio frequency output pad of a chip pattern, applying the DC probes to the bias application pad and the grounding pad of the chip pattern, and applying electrical signals to the radio frequency probes and the DC probes to inspect the chip pattern, and, if the results and not within the predetermined ranges, reestablishing contact between the radio frequency probes and the DC probes and the check pattern, and repeating the inspecting of the at least one of the check patterns.