Patent ID: 8431959

Claim:
A bi-directional electro-static discharge device comprising: a semiconductor substrate; a zener diode formed on the semiconductor substrate; a first P-N diode formed on the semiconductor substrate, the first P-N diode coupled to conduct current in series with the zener diode; a first blocking structure that extends into the semiconductor substrate and forms a first closed polygon having a periphery wherein the first P-N diode and at least a portion of the zener diode are within the first closed polygon; and a second P-N diode formed on the semiconductor substrate, the second P-N diode coupled in parallel with series combination of the zener diode and the first P-N diode, the bi-directional electro-static discharge device having a third harmonic at fundamental frequencies no less than one gigahertz wherein the third harmonic has a magnitude that is no greater than about minus thirty five dBm.