Patent ID: 8786362

Claim:
A Schottky diode having a current leakage protection structure, comprising: a Schottky diode unit, defined in a substrate and comprising: an active region, having dopants of a first conductive type; a metalized anode, formed on the active region; a cathode, formed atop the active region; and at least one isolation structure, formed between the metalized anode and the cathode; a first isolation portion, having dopants of a second conductive type, formed between the substrate and the active region, and comprising: a first well, disposed beneath the active region; and a first guard ring, surrounding the active region and connecting to the first well; and a second isolation portion, having dopants of the first conductive type, formed between the substrate and the first isolation portion, and comprising: a second well, disposed beneath the first well; and a second guard ring, surrounding the first guard ring and connecting to the second well.