Field-Plated Well Resistor for Voltage Coefficient Tuning
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Solution Overview
Problem
Well resistors in integrated circuits often have a non-zero voltage coefficient of resistance, which can lead to variations in power dissipation and circuit performance, making it challenging to achieve desired resistance characteristics without additional process steps or masks.
Innovation Solution
Incorporating a field plate above the well resistor with an insulating layer in between, allowing the field plate to modulate the majority carrier distribution, thereby reducing or increasing the voltage coefficient of the resistor based on its connection to either terminal, providing flexibility in circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a field plate is added above the well resistor to modulate carrier distribution, then the voltage coefficient of resistance can be reduced or adjusted, but the device complexity increases due to additional structures
Solution Approach 1:
An insulator layer is introduced as an intermediary between the well resistor and the field plate. This insulator enables the field plate to modulate the carrier distribution in the well resistor without direct electrical connection, allowing control of the voltage coefficient while maintaining structural simplicity and avoiding short circuits.
Solution Approach 2:
The field plate's electrical potential is adjusted to change the carrier distribution in the well resistor, thereby dynamically modifying the resistance characteristics. By varying the voltage applied to the field plate, the voltage coefficient of resistance can be reduced or tuned to desired values without changing the physical structure.
2Adaptability or versatility
If the field plate is connected to modulate carrier distribution, then resistance characteristics become adjustable, but the ease of manufacture decreases due to additional process steps
Solution Approach 1:
The field plate structure serves multiple functions: it provides electrical isolation via the insulator layer, modulates carrier distribution in the well resistor, and enables adjustable resistance characteristics. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite the added functionality.
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
This configuration enables adjustable resistance characteristics, reducing variations in power dissipation and improving circuit performance by selectively modifying the voltage coefficient of the well resistor, addressing the limitations of traditional well resistors.
Implementation Method 1
The conductive field plate is configured to modulate a majority carrier distribution within the resistor well
Implementation Method 2
An insulator is between the well resistor and the field plate
Data Source
AI summary
A semiconductor device includes a semiconductor substrate. A well resistor is in the semiconductor substrate. A field plate is above the well resistor. An insulator is between the well resistor and the field plate. The well resistor includes a first terminal and a second terminal. The field plate may be coupled to the first terminal or the second terminal.