Method and device for detecting internal resistance voltage drop on a chip

A voltage drop detecting device using a reference voltage to detect a voltage range of a local voltage wherein a multiple reference sub-voltages are preset between the reference voltage and a ground voltage, said voltage drop detecting device comprising:

• a plurality of inverters each receiving an input from the local voltage, each of said plurality of inverters having a triggering voltage corresponding to one of said preset reference sub-voltages, wherein a low to high voltage switching and outputting occurs at output terminal of said plurality of inverters when said local voltage is smaller than said triggering voltage of a corresponding inverter, and
• a plurality of positive-edge triggering devices each having a source input coupled to said reference voltage, a clock input coupled to one of said plurality of inverters and an output terminal, when a particular one of said plurality of inverters switches from said low to high switching state the reference voltage is presented at the corresponding output terminal of said positive-edge triggering device, said voltage range of the local voltage being determined by the reference voltage.