Semiconductor carrier with vertical power FET module

Patent metadata

Field	Value
Publication number	US-9735148-B2
Application number	US-201414299018-A
Country	US
Kind code	B2
Filing date	Jun 9, 2014
Priority date	Feb 19, 2002
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A monolithic power switch provides a semiconductor layer, a three dimensional FET formed in the semiconductor layer to modulate currents through the semiconductor layer, and a toroidal inductor with a ceramic magnetic core formed on the semiconductor layer around the FET and having a first winding connected to the FET.

First claim

What is claimed is:

1. A circuit module having a semiconductor power switch, comprising:
a planar first electrode;
a first layer of doped semiconductor material disposed on the planar first electrode that forms ohmic contact with the planar first electrode; a second layer of doped semiconductor material disposed on the first layer that is electronically patterned to form a field effect transistor (FET);
a second electrode disposed upon the second layer;
an elongated gate electrode located to modulate current flow from the planar first electrode through the second layer to the second electrode and having a ratio of gate electrode width to gate electrode length that is greater than or equal to 100;
wherein the elongated gate electrode forms a serpentine pattern over the second layer and is insulated from the second layer and the second electrode; and
wherein the elongated gate electrode comprises a conductor that forms a resonant transmission line by configuring the conductor to form the serpentine patterned elongated gate electrode that contains a capacitive element determined by charge collected beneath the elongated gate electrode, a resistive element determined by the conductor length and cross-sectional area of the conductor used to form the serpentine patterned elongated gate , and an inductive element formed by half-turns that loop the serpentine pattern back upon itself, which resonant transmission line is resonant at a frequency determined by internal capacitance and inductance.

2. The switch of claim 1 , wherein the elongated gate electrode is meandered adjacent to a contiguous surface area of the second layer to maximize gate electrode width over that contiguous surface area.

3. The switch of claim 2 , wherein the first layer is formed as a region of the substrate and the contiguous surface area is surrounded by a toroidal transformer having a ceramic core formed on the substrate.

4. The switch of claim 2 , wherein the elongated gate electrode includes adjacent parallel gate portions.

5. The switch of claim 1 , wherein the FET includes a pair of parallel elongated channel regions located beneath the elongated gate electrode.

6. The switch of claim 5 , wherein the elongated gate electrode is meandered and has a gate electrode width to gate electrode length ratio that is greater than or equal to 10 6 .

7. The switch of claim 1 , wherein the first semiconductor layer is doped to form a power FET as an insulated gate bipolar transistor when making electrical contact with the second semiconductor layer.

Assignees

• De Rochemont L Pierre

Inventors

• De Rochemont L Pierre

Classifications

• H10W90/00

  Package configurations · CPC title

• H10W44/601

  Capacitive arrangements (H10W44/20 takes precedence) · CPC title

• H10W44/501

  Inductive arrangements (H10W44/20 takes precedence) · CPC title

• H01F30/16

  Toroidal transformers · CPC title

• Y10T428/12493

  Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] · CPC title