Quantized Supply Voltage Control for Multi-Stage Power Amplifiers
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Solution Overview
Problem
Traditional power amplifiers in telecommunications face inefficiencies due to the tradeoff between linearity and power efficiency, especially in high peak-to-average ratio signals, leading to increased power consumption and system complexity, which affects battery life and heat management in portable devices.
Innovation Solution
A multi-quantized digitally controlled power supply voltage system for multiple amplifier stages, where time-varying envelope signals are sampled, quantized, and decomposed into quasi-constant or constant envelope signals, allowing for optimized amplification by nonlinear amplifiers without the need for envelope tracking or dynamic supply modulation, thereby minimizing distortion and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear power amplifiers are biased to deliver peak RF output power, then linearity is improved, but power efficiency deteriorates due to excessive DC input power dissipation
Solution Approach 1:
The power amplifier system is divided into multiple parallel amplifiers (first, second, third amplifiers) each operating at different back-off levels. This segmentation allows each amplifier to operate in its optimal efficiency region while collectively providing linear amplification through their combined output, resolving the contradiction between linearity and power efficiency.
Solution Approach 2:
The system dynamically switches between different amplifier combinations based on the input signal envelope level. A control mechanism selects which amplifiers to activate and adjusts their operating points in real-time, enabling the system to adapt to varying signal conditions and maintain both linearity and efficiency across different operating scenarios.
2Reliability
If power amplifiers operate at lower average output power with peak power capability, then linearity is maintained, but power efficiency deteriorates due to excess DC power dissipation
Solution Approach 1:
Multiple amplifiers are segmented to handle different power levels, with each amplifier optimized for specific operating ranges. This allows the system to distribute the power handling workload efficiently, reducing overall DC power dissipation while maintaining linearity through coordinated operation of the segmented amplifier units.
Solution Approach 2:
The system changes operating parameters (supply voltages, bias currents) of individual amplifiers based on the signal envelope level. By dynamically adjusting these parameters, the amplifiers can operate at optimal efficiency points for each operating condition, minimizing DC power dissipation while preserving signal linearity.
3Productivity
If high order modulation methods are used to optimize spectral efficiency, then data rate is improved, but power amplifier efficiency deteriorates due to high peak-to-average ratio signals
Solution Approach 1:
The system dynamically adapts to high PAR signals by switching between different amplifier configurations based on the instantaneous signal envelope. This dynamic response allows the system to maintain high spectral efficiency with high order modulation while preserving amplifier efficiency through real-time adaptation to signal characteristics.
Solution Approach 2:
The amplifier system is segmented into multiple units that can be independently controlled, allowing each segment to handle specific portions of the high PAR signal. This segmentation enables efficient handling of peak power demands without compromising overall system efficiency or spectral performance.
4Use of energy by moving object
If envelope tracking or dynamic supply modulation is implemented to improve efficiency, then power efficiency is improved, but system complexity increases
Solution Approach 1:
Instead of implementing complex envelope tracking in a single amplifier, the system segments the amplification function across multiple simpler amplifier units. Each unit operates with relatively simple control, and their combined output achieves the efficiency goals, thereby reducing overall system complexity while maintaining power efficiency.
Solution Approach 2:
The system uses multiple copies of simpler amplifier stages rather than one complex amplifier with dynamic supply modulation. This approach achieves similar efficiency improvements through parallel operation of identical or similar units, reducing the complexity of individual components while maintaining overall system performance.
Data Source
AI summary
Methods and systems for power amplification with digital quantized power supply with multiple amplifiers are disclosed herein. In one embodiment, In one embodiment, a time-varying envelope signal is sampled, quantized and decomposed into several constituent signals that are individually amplified, and then combined to form a desired amplified version of the quantized time-varying envelope. Amplitude, phase and/or frequency characteristics of one or more of the signals and supply voltages Vdd and source current of one or more amplifiers are digital controlled based on the information provided by quantization process and slow and fast power control information. Amplitude, phase and/or frequency characteristics of one or more of the constituent signals to be amplified are controlled to provide the desired amplitude, phase, frequency, and/or spectral characteristics of the desired quantized version of the time-varying envelope signal.