Shared Envelope Tracking IC for Multi-Radio Power Amplifiers
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Solution Overview
Problem
Existing power amplifiers in wearable devices face challenges in reducing power consumption and thermal dissipation while supporting multiple wireless communication technologies, limiting their integration into small form factor devices.
Innovation Solution
A single envelope tracking (ET) integrated circuit (ETIC) is used to manage two amplifier circuits, allowing one to operate at higher power using ET voltage and the other at lower power using non-ET voltage, optimizing power amplification efficiency and reducing the footprint of the power amplifier apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifier circuits are used to support different wireless communication technologies, then the adaptability and functionality of the device are improved, but the device footprint and complexity increase
Solution Approach 1:
The patent implements a single ETIC that can serve multiple amplifier circuits for different wireless communication technologies (e.g., LTE, Wi-Fi, Bluetooth). The ETIC is designed with multiple output ports and a control circuit that can dynamically allocate ET voltage to different amplifiers based on their operational status, enabling one component to perform multiple functions and reducing the overall device footprint.
Solution Approach 2:
The control circuit in the ETIC dynamically determines which amplifier circuits are active and allocates ET voltage accordingly. When one amplifier is inactive, the ETIC can provide ET voltage to another amplifier, enabling flexible and dynamic resource allocation. This dynamic operation allows the system to adapt to different communication scenarios without requiring separate dedicated ETICs for each amplifier.
2Loss of energy
If envelope tracking voltage is provided to all amplifier circuits simultaneously, then power amplification efficiency is improved for all circuits, but the device complexity and control overhead increase
Solution Approach 1:
The control circuit in the ETIC incorporates feedback mechanisms to monitor the operational status of each amplifier circuit. Based on this feedback, the control circuit intelligently determines which amplifiers are currently active and allocates ET voltage accordingly. This feedback-driven approach optimizes power efficiency by providing ET voltage only when and where it is needed, rather than continuously to all amplifiers, thereby reducing unnecessary energy consumption and simplifying control logic.
3Area of stationary object
If a single ETIC is used to support multiple amplifier circuits, then the device footprint is reduced, but the control complexity for managing multiple amplifiers increases
Solution Approach 1:
The ETIC is segmented into multiple output ports, each capable of independently providing ET voltage to different amplifier circuits. The control circuit is divided into multiple control stages, with each stage managing a specific amplifier circuit. This segmentation allows the single ETIC to handle multiple amplifiers independently, reducing the need for a monolithic complex control system and enabling modular management of different wireless communication technologies.
Data Source
AI summary
An envelope tracking (ET) power amplifier apparatus is provided. In a non-limiting example, the ET power amplifier apparatus includes a single ET integrated circuit (ETIC) configured to support at least a pair of amplifier circuits for amplifying different radio frequency (RF) signals. One of the amplifier circuits may be configured to amplify a respective RF signal to a higher power and thus will operate based on an ET voltage whenever possible. Another amplifier circuit, on the other hand, may be configured to amplify a respective RF signal to a relatively lower power and thus will only operate based on the ET voltage when the other amplifier circuit is inactive. By employing a single ETIC, it may be possible to reduce footprint of the ET power amplifier apparatus, thus making it possible to fit the ET power amplifier apparatus into a small form factor electronic device, such as a wearable device.