Front End Module Power Sensing for PA Fault Isolation
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Solution Overview
Problem
Existing electronic devices face issues with power amplifiers (PAs) becoming partially damaged, leading to decreased device stability and communication performance due to shared power supply circuitry connections, which can cause further damage and limit the functionality of other PAs.
Innovation Solution
The electronic device includes a power sensing circuitry to identify partially damaged PAs and a control circuitry to disconnect the power supply from the affected PA, using switches and comparators to manage power distribution and ensure uninterrupted operation by rerouting signals through alternative PAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PAs are connected to shared power supply circuitry, then power distribution efficiency is improved, but device stability deteriorates when a PA becomes damaged
Solution Approach 1:
The patent segments the power supply connection by introducing individual switches between the power supply circuitry and each PA. This allows the power supply to be divided into separate controllable paths, enabling isolation of a damaged PA while maintaining power distribution to other PAs, thus resolving the contradiction between shared power efficiency and system reliability
Solution Approach 2:
The patent introduces switches as intermediary components between the power supply circuitry and PAs. These switches act as mediators that can be controlled to disconnect power to a specific PA when damage is detected, preventing the damaged PA from affecting other components while maintaining the shared power supply architecture
2Reliability
If switches are added to disconnect damaged PAs, then device stability is improved, but device complexity increases
Solution Approach 1:
The switches in the patent serve multiple functions: they enable normal power distribution during healthy operation, isolate damaged PAs when needed, and prevent cascading failures. This multi-functionality justifies the added complexity by providing both protection and control capabilities within the same component
Solution Approach 2:
The patent implements a feedback mechanism where the control circuitry monitors PA status and automatically controls the switches to disconnect damaged PAs. This closed-loop feedback system automates the protection function, reducing the need for complex manual control circuits while improving reliability
3Reliability
If control circuitry is added to detect and respond to PA damage, then communication performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The control circuitry in the patent performs self-diagnosis by monitoring its own operational parameters and detecting anomalies that indicate PA damage. This self-service capability allows the system to automatically identify and respond to failures without requiring external diagnostic equipment or highly precise manual calibration
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 solution enhances device stability and communication performance by quickly identifying and isolating damaged PAs, preventing further damage and ensuring seamless operation through alternative PAs, thereby maintaining enhanced usability.
Implementation Method 1
a comparator configured to provide, to the control circuitry, a signal indicating whether a difference value between the voltage from the power supply circuitry and a voltage of a source of the transistor included in the PA in the first FEM is less than a reference value
Data Source
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AI summary
This electronic device may comprise: a first antenna and a second antenna; a power source supply circuit; a switch; a power amplifier (PA) connected to the power source supply circuit through the switch in order to obtain transmit power of a first wireless signal transmitted through the first antenna on the basis of a voltage received from the power source supply circuit; a first front end module (FEM) including a control circuit; and a second FEM including a PA connected to the power source supply circuit in order to obtain transmit power of a second wireless signal transmitted through the second antenna on the basis of the voltage received from the power source supply circuit.