Shared Envelope Tracking Circuit for Multi-PA Load Optimization
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Solution Overview
Problem
Existing 5G-NR mobile communication devices face challenges in efficiently managing multiple power amplifiers due to varying antenna loads, leading to inefficiencies and increased cost and area consumption when separate ET circuits are used for each amplifier.
Innovation Solution
A single ET integrated circuit generates optimized control signals for multiple power amplifiers based on load estimates derived from sensed current and voltage, improving efficiency and reducing the need for individual ET circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a unique ET circuit is provided for each power amplifier, then the efficiency of each power amplifier is optimized, but the cost, area consumed, and power consumed increase significantly
Solution Approach 1:
The patent merges multiple ET circuits into a single shared ET circuit that serves multiple power amplifiers. The single ET circuit includes a voltage ramp generator and a load estimation unit that collectively manage envelope tracking for all power amplifiers, thereby reducing component count, area consumption, and power overhead while maintaining efficiency optimization capability.
Solution Approach 2:
The single ET circuit is designed with multi-functionality to handle envelope tracking for multiple power amplifiers simultaneously. It incorporates a load estimation unit that can estimate the combined load of multiple power amplifiers and generate appropriate control signals, making the circuit universal rather than dedicated to a single amplifier.
2Device complexity
If a single ET circuit is used for multiple power amplifiers, then cost and area are reduced, but the ability to optimize ET voltage for each individual amplifier load decreases
Solution Approach 1:
The ET circuit incorporates a load estimation unit that continuously monitors and estimates the load conditions of multiple power amplifiers. This feedback mechanism allows the circuit to adapt its envelope tracking control signals based on the actual combined load state, ensuring optimal efficiency even with a single shared circuit serving multiple amplifiers with varying loads.
3Adaptability or versatility
If separate ET circuits are used for each power amplifier, then individual load optimization is achieved, but the overall system cost and power consumption increase
Solution Approach 1:
Multiple independent ET circuits are merged into a single shared ET circuit that manages envelope tracking for all power amplifiers. This consolidation reduces the total power consumption associated with multiple separate circuits while maintaining the ability to optimize efficiency through unified load estimation and control signal generation.
4Productivity
If multiple power amplifiers are used for MIMO and beamforming, then data throughput is improved, but the complexity of managing varying antenna loads increases
Solution Approach 1:
The ET circuit is designed as a universal multi-functional unit that can manage envelope tracking for multiple power amplifiers used in MIMO and beamforming configurations. The load estimation unit adapts to different antenna load conditions, providing unified control that simplifies the management of complex multi-antenna systems while maintaining high data throughput capability.
Data Source
AI summary
An envelope tracking (ET) radio frequency (RF) front-end circuit receives a single tracking signal (e.g., Vramp) from a baseband transceiver and generates a plurality of control signals (Vcc). The control signals are created by a multiple control signal generator circuit based on a calculated load estimate for each relevant power amplifier. The load estimate may be calculated from a sensed current and voltage. By providing control signals optimized for loads presented to the power amplifiers, the overall efficiency of the transmitter is improved.