Integrated Gate Resistor and Diode Layout for Low-Noise MOSFET Switching
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Solution Overview
Problem
Existing techniques for controlling the switching speed of semiconductor devices to reduce noise often increase the mounting area and manufacturing cost, whether by adding external resistors and diodes or integrating them onto the semiconductor substrate.
Innovation Solution
A semiconductor device with built-in gate resistors and a rectifier diode, where the resistors and diode are formed on the semiconductor substrate, allowing for controlled switching speed without increasing the device size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resistors and diodes are provided on a substrate outside the semiconductor device to control switching speed, then switching speed control is achieved, but mounting area and manufacturing cost increase
Solution Approach 1:
The patent merges the external resistor and diode components into the semiconductor device substrate itself. The first resistor (R1) and second resistor (R2) with diode (D1) are formed directly on the substrate, eliminating the need for separate external components and reducing mounting area while maintaining switching speed control functionality.
Solution Approach 2:
The substrate serves multiple functions: it acts as both the semiconductor device platform and the mounting platform for the resistors and diode. This multi-functional approach integrates component housing and circuit board functions into a single element, reducing overall system size.
2Ease of operation
If resistors and diodes are formed on the semiconductor substrate by stacking N type and P type semiconductor layers, then switching speed control is achieved, but device size increases
Solution Approach 1:
The patent extracts the diode function from a traditional stacked N-P layer structure and implements it using a P type semiconductor region formed on an N type semiconductor layer through selective doping. This approach achieves the same rectifier function with reduced vertical depth and device volume.
3Ease of operation
If a P type semiconductor region is formed by using a mask on the N type semiconductor layer, then switching speed control is achieved, but manufacturing cost increases
Solution Approach 1:
The N type semiconductor layer serves dual purposes: as the base layer for the semiconductor device and as the substrate for forming the P type semiconductor region that creates the diode function. This eliminates the need for separate substrate preparation and reduces manufacturing steps.
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 effectively reduces noise during switching operations by allowing gentle switching when turned ON and rapid switching when turned OFF, while maintaining compactness and affordability.
Implementation Method 1
a rectifier diode included in the first resistor or the second resistor between the gate pad and the gate wiring
Data Source
AI summary
The present invention suppresses an increase in manufacturing cost and reduces switching noise. A field-effect transistor having a gate electrode embedded in a trench in an upper surface of a semiconductor substrate, a source region formed in the semiconductor substrate, and a drain region formed on a lower surface of the semiconductor substrate is provided with a gate wiring formed on the semiconductor substrate and being electrically connected to the gate electrode, a gate pad formed on the semiconductor substrate, a first resistor connected between the gate pad and the gate wiring and being configured to function when the field-effect transistor is turned ON, a second resistor connected between the gate pad and the gate wiring and being configured to function when the field-effect transistor is turned OFF, and a rectifier diode included in the first resistor or the second resistor between the gate pad and the gate wiring.