Power Amplifier Thermal Sensing via Adjacent Resistor Placement
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Solution Overview
Problem
Compound semiconductor-based power amplifiers, such as those using GaN or GaAs, face challenges in accurately measuring junction temperature due to limited metal layers available for design, making it difficult to place thermal temperature sensors effectively.
Innovation Solution
Incorporating a semiconductor resistor adjacent to the transistor array in the power amplifier to generate a signal indicative of the temperature, allowing for junction temperature measurement using a look-up-table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermal temperature sensor is placed to measure junction temperature, then temperature measurement capability is improved, but device layout complexity increases due to limited metal layers in compound semiconductor fabrication
Solution Approach 1:
The patent combines the temperature sensing function with the existing transistor array structure by using a semiconductor resistor that is integrated adjacent to the transistor array. This merged approach allows temperature measurement without adding separate complex sensor structures, thereby improving measurement capability while minimizing layout complexity.
Solution Approach 2:
The semiconductor resistor serves dual purposes: it functions as part of the power amplifier circuitry while simultaneously acting as a temperature sensor. This self-service approach allows the existing component to provide temperature measurement functionality, eliminating the need for additional dedicated sensor structures and simplifying the overall design layout.
2Measurement precision
If a semiconductor resistor is placed adjacent to the transistor array, then temperature detection accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by placing the semiconductor resistor in a specific location adjacent to the transistor array where the temperature is most representative of the junction temperature. This strategic local placement ensures accurate temperature detection while allowing for standard manufacturing tolerances, as the resistor is positioned in an optimal thermal zone rather than requiring precise placement throughout the device.
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 accurate temperature detection and dynamic control of power amplifiers, preventing overheating and improving design layout by effectively measuring the operating temperature of power amplifiers.
Implementation Method 1
a semiconductor resistor configured to generate a signal indicative of a temperature of the transistor array
Data Source
AI summary
Thermal temperature sensors for power amplifiers are provided herein. In certain implementations, a semiconductor die includes a compound semiconductor substrate, and a power amplifier including a plurality of field-effect transistors (FETs) configured to amplify a radio frequency (RF) signal. The plurality of FETs are arranged on the compound semiconductor substrate as a transistor array. The semiconductor die further includes a semiconductor resistor configured to generate a signal indicative of a temperature of the transistor array. The semiconductor resistor is located adjacent to one end of the transistor array.