Envelope Tracking IC for Multi-Stage and Doherty Power Amplifiers
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Solution Overview
Problem
5G-NR mobile communication devices face challenges in efficiently managing power amplifiers due to susceptibility to propagation attenuation and interference in mmWave RF spectra, requiring flexible power management to maintain data throughput across various transmission schemes.
Innovation Solution
An envelope tracking integrated circuit (ETIC) capable of generating ET voltages at different levels to support multiple types of power amplifiers, such as multi-stage and Doherty power amplifiers, allowing for flexible adaptation to various power management scenarios and topologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single power amplifier configuration is used, then device complexity is reduced, but adaptability to different transmission schemes and applications is limited
Solution Approach 1:
The power management circuit is designed with multiple voltage output nodes (first voltage output node, second voltage output node, third voltage output node) that can provide different voltage levels to different power amplifier types. The circuit can dynamically configure which voltage output node connects to which power amplifier based on the detected amplifier type, enabling a single circuit to universally support differential PAs, single-stage PAs, multi-stage PAs, balanced PAs, and Doherty PAs.
Solution Approach 2:
The power management circuit employs dynamic switching mechanisms where connection relationships between voltage output nodes and power amplifier terminals are changed based on real-time detection of power amplifier type. The control circuit detects the PA type and dynamically reconfigures the voltage supply topology, allowing the same hardware to adapt its behavior for different amplifier configurations without requiring separate dedicated circuits for each amplifier type.
2Use of energy by moving object
If fixed voltage levels are provided to power amplifiers, then circuit design is simplified, but efficiency is reduced for specific amplifier types like multi-stage and Doherty amplifiers
Solution Approach 1:
Different voltage levels are provided to different parts of the power amplifier system based on specific requirements. For example, in a multi-stage PA configuration, the first voltage output node provides a first voltage level to the first power amplifier terminal while the second voltage output node provides a second voltage level to the second power amplifier terminal. In Doherty amplifier configurations, specific voltage levels are applied to carrier and peaking amplifiers based on their operational requirements, optimizing efficiency for each component.
Solution Approach 2:
The power management circuit dynamically changes voltage parameters (voltage levels) based on the detected power amplifier type and operational conditions. The control circuit adjusts which voltage output nodes are active and at what levels, transforming the voltage supply from a fixed parameter to a dynamically adjustable one that adapts to different amplifier types and operating modes.
3Adaptability or versatility
If envelope tracking voltages are generated at single voltage level, then power management is simplified, but support for wider modulation bandwidth and specific amplifier types is limited
Solution Approach 1:
The envelope tracking voltage generation is segmented into multiple independent voltage output nodes (first, second, third voltage output nodes), each capable of generating voltages at different levels. This segmentation allows the system to provide appropriate voltage levels to different power amplifier stages or components simultaneously, supporting wider modulation bandwidth and various amplifier topologies without requiring a single complex monolithic voltage generator.
Data Source
AI summary
An envelope tracking (ET) integrated circuit (ETIC) operable with multiple types of power amplifiers is provided. The ETIC is configured to provide one or more ET voltages to a power amplifier(s) for amplifying a radio frequency (RF) signal. In embodiments disclosed herein, the ETIC can be configured to generate the ET voltages at same or different voltage levels based on specific types of the power amplifier(s), such as multi-stage power amplifier and Doherty power amplifier, and for a wider modulation bandwidth of the RF signal. As such, the ETIC can be flexibly adapted to enable a variety of power management scenarios and/or topologies.