Backgate Gate Driver Circuit for Higher Current Density
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Solution Overview
Problem
Existing gate driver circuits face challenges in achieving higher output current per unit area while maintaining low manufacturing costs and efficient operation.
Innovation Solution
A gate driver device with a first field effect transistor and a driver circuit that supplies a backgate drive signal, utilizing a first backgate structure and a dielectric layer to enhance current-carrying capability per unit area, and includes a driver circuit to control the backgate voltage levels for optimal transistor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate driver circuit size is reduced to decrease manufacturing costs, then manufacturing cost decreases, but output current per unit area decreases
Solution Approach 1:
The invention utilizes the vertical dimension by introducing a backgate structure beneath the semiconductor layer, separated by a dielectric layer. This allows control of channel conductivity from both the front gate and backgate, effectively adding a third dimension to the transistor control mechanism. The backgate structure enables enhanced current-carrying capability without increasing the planar footprint of the device.
Solution Approach 2:
The invention changes the electrical parameters of the transistor by applying specific voltages to the backgate structure. By adjusting the backgate voltage, the channel conductivity can be modulated to optimize the output current. This parameter control allows the transistor to operate at higher current densities while maintaining the same physical dimensions, thereby increasing output current per unit area without compromising manufacturing cost efficiency.
2Productivity
If the output current per unit area is increased, then productivity increases, but device complexity increases
Solution Approach 1:
The gate driver device is segmented into distinct functional layers: the semiconductor layer containing the transistor, the dielectric layer providing isolation, and the backgate structure for electrical control. This segmentation allows each component to be optimized independently while working together to achieve high output current per unit area. The modular structure manages complexity by distributing functions across separate layers rather than concentrating them in a single complex structure.
Solution Approach 2:
The backgate structure serves multiple functions: it controls the channel conductivity, enhances the output current capability, and can be used to adjust the threshold voltage of the transistor. This multi-functionality allows a single additional structure to address multiple performance requirements simultaneously, increasing productivity without proportionally increasing device complexity.
3Productivity
If the backgate structure is added to increase output current, then productivity increases, but leakage current may increase
Solution Approach 1:
The dielectric layer acts as an intermediary between the backgate structure and the semiconductor layer. It provides electrical isolation while allowing the backgate voltage to influence the channel conductivity through capacitive coupling. This intermediary structure enables control of the output current without creating direct electrical pathways that could increase leakage current, as the dielectric prevents unwanted charge carrier generation and transport.
Solution Approach 2:
The backgate structure enables feedback control of the channel conductivity. By monitoring the transistor operation and adjusting the backgate voltage accordingly, the system can optimize the output current while maintaining low leakage. The backgate voltage can be dynamically adjusted to compensate for threshold voltage variations and to ensure the transistor operates in the desired region, thereby maximizing productivity while minimizing harmful leakage effects.
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 solution enables higher output currents and reduces chip area requirements, improving efficiency and reducing adverse effects on leakage current and voltage blocking capability.
Implementation Method 1
a dielectric layer is between the semiconductor substrate and the first semiconductor layer, wherein the first well and at least a portion of the first semiconductor layer are directly opposite each other
Implementation Method 2
The first driver circuit supplies a first backgate drive signal to the first backgate structure
Data Source
AI summary
A gate driver device includes a first field effect transistor and a first driver circuit. The first field effect transistor includes a first gate electrode and a first backgate structure. The first driver circuit supplies a first backgate drive signal to the first backgate structure.