Adjustable PA Supply Voltage for Wi-Fi Self-Interference Control
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Solution Overview
Problem
Existing RF communication systems face challenges in managing self-interference and power efficiency due to the narrow frequency separation between Wi-Fi 5 GHz and Wi-Fi 6 GHz bands, particularly in simultaneous transmit-receive operations, which require stringent filtering that is difficult to fabricate and result in reduced range and throughput.
Innovation Solution
Implementing a power amplifier system with an adjustable supply voltage controlled by a feedback network and a supply control switch, allowing dynamic control of saturated output power (Psat) to enhance performance in challenging scenarios like simultaneous transmit-receive operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stringent filtering is used to manage self-interference in simultaneous transmit-receive operations, then interference is reduced, but manufacturing difficulty increases and range decreases
Solution Approach 1:
The patent changes the operating parameters of the power amplifier by dynamically adjusting the supply voltage level. This allows the PA to operate at different power levels (e.g., reduced power during simultaneous transmit-receive operations) without requiring complex filtering hardware, thereby resolving the contradiction between interference management and manufacturing ease
Solution Approach 2:
The patent implements dynamic control of the power amplifier's supply voltage based on operational conditions. By making the power level adjustable in real-time, the system can adapt to simultaneous transmit-receive scenarios without fixed stringent filters, reducing both manufacturing complexity and signal loss
2Use of energy by moving object
If adjustable supply voltage is implemented to dynamically control Psat, then power efficiency and linearity improve, but device complexity increases
Solution Approach 1:
The control signal serves multiple functions simultaneously: it adjusts the supply voltage level for power efficiency, maintains linearity during simultaneous operations, and can be integrated with existing Wi-Fi protocol control mechanisms. This multi-functionality reduces the need for separate control circuits, mitigating the complexity increase
Solution Approach 2:
The system uses feedback from the Wi-Fi protocol state (e.g., simultaneous transmit-receive detection) to automatically adjust the supply voltage. This closed-loop control achieves power efficiency and linearity improvements through existing feedback mechanisms rather than adding complex independent control systems
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 system improves power amplifier performance by dynamically adjusting Psat, reducing out-of-band noise, and maintaining linearity, thereby enhancing range and throughput in complex RF communication environments.
Implementation Method 1
a DC-to-DC converter configured to generate a supply voltage based on a feedback signal received from a feedback network
Implementation Method 2
The supply control switch is operable to control a voltage level of the supply voltage based on the control signal
Implementation Method 3
a power amplifier powered by the supply voltage and configured to amplify a radio frequency transmit signal
Data Source
AI summary
Apparatus and methods using an adjustable supply voltage to dynamically control saturated output power (Psat) of a power amplifier are disclosed. In certain embodiments, a front-end module includes a power amplifier that amplifies an RF transmit signal and a supply control switch this is coupled to a feedback network of a DC-to-DC converter. The supply control switch receives a control signal for adjusting Psat from a control circuit, which can be part of a Wi-Fi system controller.