Semiconductor Device Dynamic Electric Field Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bipolar transistors face a trade-off between high power performance and high frequency performance, with high breakdown voltage devices having low speed and high-speed devices having low breakdown voltage, limiting their flexibility and efficiency in RF power amplifiers.
Innovation Solution
A semiconductor device with one or more field gate terminals for dynamic control of the electric field in the drift region, using a feedback circuit with an inverter to adjust bias voltages in real-time based on time-varying signals, allowing for dynamic control of breakdown voltage and cut-off frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high breakdown voltage devices are used, then power capability is improved, but speed (cut-off frequency) deteriorates
Solution Approach 1:
The patent applies dynamic biasing control to the field gate terminal, allowing the electric field distribution in the drift region to be dynamically adjusted during operation. This enables the device to switch between high breakdown voltage mode (for power capability) and high speed mode (for cut-off frequency) based on real-time signal conditions, resolving the static trade-off between power and speed
Solution Approach 2:
The invention changes the electric field distribution parameter in the drift region by applying different bias voltages to the field gate terminal. By modifying this parameter dynamically, the device can achieve both high breakdown voltage and high cut-off frequency characteristics at different times, eliminating the fixed compromise between power capability and speed
2Power
If large-area transistors are used to obtain high currents, then power performance is improved, but capacitance increases
Solution Approach 1:
The patent introduces a field gate terminal that locally controls the electric field in the drift region, allowing different parts of the device to operate under different field conditions. This local control enables high current operation without proportionally increasing capacitance, as the field distribution can be optimized to minimize capacitive effects while maintaining high current capability
3Power
If breakdown voltage is increased to enable high voltage swing, then power amplifier efficiency is improved, but device speed decreases
Solution Approach 1:
The invention implements dynamic control of the field gate bias voltage that responds to real-time signal conditions. During phases requiring high voltage swing, the bias is adjusted to increase breakdown voltage; during phases requiring high speed operation, the bias is adjusted to optimize speed, thereby resolving the contradiction between voltage swing and device speed
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
Enables real-time modification of transistor characteristics to optimize power capability and linearity by dynamically adjusting the electric field, allowing for higher breakdown voltage and current, enhancing the device's performance and flexibility in RF applications.
Implementation Method 1
a semiconductor device with one or more field gate terminals for controlling the electric field in a drift region of the semiconductor device
Implementation Method 2
a feedback circuit configured to dynamically control the bias voltage or voltages applied to the field gate terminal or terminals, with different control voltages used for different semiconductor device characteristics in real-time
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A circuit, comprising a semiconductor device with one or more field gate terminals for controlling the electric field in a drift region of the semiconductor device; and a feedback circuit configured to dynamically control a bias voltage or voltages applied to the field gate terminal or terminals, with different control voltages used for different semiconductor device characteristics in real-time in response to a time-varying signal at a further node in the circuit.