Patent ID: 7589392
Filing Date: 2009-09-15
Classification: H01F,H01L,H03H

Abstract:
1. A semiconductor filter structure comprising: a semiconductor substrate of a first conductivity type and having a first major surface and a second major surface opposite to the first major surface; a first doped region of a second conductivity type formed in the semiconductor substrate; a first dielectric layer formed overlying a portion of the first doped region, wherein the first doped region is continuous adjacent to the first dielectric layer; a second doped region of the second conductivity type formed in the semiconductor substrate; a second dielectric layer formed overlying a portion of the second doped region, wherein the second doped region is continuous adjacent to the second dielectric layer; a third doped region of the second conductivity type formed in the semiconductor substrate; a third dielectric layer formed overlying a portion of the third doped region, wherein the third doped region is continuous adjacent to the third dielectric layer; a first conductive electrode formed overlying the semiconductor substrate and coupled to the first doped region; a second conductive electrode formed overlying the first dielectric layer and overlying the second dielectric layer; and a third conductive electrode formed overlying the third dielectric layer and coupled to the second doped region, wherein the first doped region forms a first plate of a first capacitor and a first electrode of a first TVS device, and wherein the second doped region forms a first plate of a second capacitor and a first electrode of a second TVS device, and wherein the third doped region forms a first plate of a third capacitor and a first electrode of a third TVS device, and wherein the second major surface forms a second electrode for at least one of the first, second and third TVS devices.