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US 8,896,131 B2Granted
Cascode scheme for improved device switching behavior
AssigneeAlpha and Omega Semiconductor Incorporated
InventorsAnup Bhalla, Sik Lui, Jun Hu, Fei Wang
Life of this patent
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Abstract
A switching device includes a low voltage normally-off transistor and a control circuit built into a common die. The device includes source, gate and drain electrodes for the transistor and one or more auxiliary electrodes. The drain electrode is on one surface of a die on which the transistor is formed, while each of the remaining electrodes is located on an opposite surface. The one or more auxiliary electrodes provide electrical contact to the control circuit, which is electrically connected to one or more of the other electrodes.
Claims23
A switching device, comprising:
- a low voltage normally-off field effect transistor having four or more electrodes including a source electrode, a drain electrode, a gate electrode, and one or more auxiliary electrodes, wherein the drain electrode is on one surface of a semiconductor die from which the low voltage normally-off transistor is formed, while each of the remaining electrodes is located on an opposite surface of the semiconductor die, the one or more auxiliary electrodes providing electrical contact to a control circuit that is electrically connected to one or more of the other electrodes, wherein the one or more auxiliary electrodes are not directly connected to any of a source region, a gate region, or a drain region of the low voltage normally-off field effect transistor, wherein the control circuit is built into the semiconductor die from which the low voltage normally-off transistor is formed.
Dependencies are inferred from the claim text.