Semiconductor Relay Structure for Gate Current Noise Control
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Solution Overview
Problem
Existing semiconductor devices face challenges in controlling noise levels during voltage transitions, with ringing noise occurring predominantly when the voltage is turned on, and there is a need to reduce this noise while maintaining space efficiency and appropriate gate current control.
Innovation Solution
A semiconductor device design incorporating a relay portion with first and second conductivity type regions, allowing for varying current paths based on voltage direction, thereby adjusting resistance and controlling gate current behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diode and resistor circuit is disposed outside the semiconductor device to control noise, then noise control is improved, but space efficiency is reduced
Solution Approach 1:
The patent merges the noise control circuit (diode and resistor) with the semiconductor device by integrating it into the semiconductor layer. The relay portion with first and second conductivity type regions is formed within the semiconductor layer, and contacts are made through the semiconductor layer, combining what was previously separate external components into a single integrated device structure.
Solution Approach 2:
The patent transitions from a two-dimensional planar layout to a three-dimensional vertical structure by forming the relay portion and contacts within the thickness of the semiconductor layer. The first contact connects to the first conductivity type region and the second contact connects to the second conductivity type region, creating vertical current paths that utilize the third dimension (depth) to achieve noise control without increasing planar area.
2Object-affected harmful factors
If resistance is increased to reduce noise when voltage is turned on, then noise control is improved, but current flow capability is reduced
Solution Approach 1:
The patent creates a dynamic resistance system where the resistance value changes based on the direction of current flow. When voltage is turned on (forward bias), the diode conducts and provides a low-resistance path through both parallel resistor paths. When voltage is turned off (reverse bias), the diode blocks current and only one resistor path remains, effectively increasing resistance. This dynamic adaptation allows noise reduction without permanently sacrificing current flow capability.
Solution Approach 2:
The patent changes the electrical parameter (resistance) based on the operational state by using the diode's directional conductivity. The circuit transitions between different resistance states: low resistance during turn-on (both parallel paths active) and high resistance during turn-off (only one path active via diode blocking). This parameter change enables the system to optimize for noise reduction when needed while maintaining current flow capability when operational.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces noise during voltage transitions by altering resistance based on current direction, maintaining space efficiency and enabling precise gate current management.
Implementation Method 1
a relay portion that is formed on the semiconductor layer so as to straddle the first conductor and the second conductor and that is made of a semiconductor having a first conductivity type region and a second conductivity type region
Implementation Method 2
When a positive voltage with respect to the second conductor is applied to the first conductor, the flow of an electric current between the first conductor and the second conductor takes a direction from the first conductor toward the second conductor. In this case, a reverse current will flow to a pn junction
Data Source
AI summary
A semiconductor device includes a semiconductor layer, a first conductor disposed on the semiconductor layer, a second conductor disposed on the semiconductor layer so as to be separated from the first conductor, a relay portion that is formed on the semiconductor layer so as to straddle the first conductor and the second conductor and that is made of a semiconductor having a first conductivity type region and a second conductivity type region, a first contact by which the first conductivity type region and the second conductivity type region are electrically connected to the first conductor, and a second contact that electrically connects the first conductivity type region of the relay portion and the second conductor together and that is insulated from the second conductivity type region.