Multi-Gain PA Switching Based on Waveform Linearity
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Solution Overview
Problem
Existing multi-gain state power amplifiers in wireless communication devices do not dynamically adjust their switch points to account for differences in waveform linearity, leading to inefficient power consumption and potential interference issues due to non-linear operation.
Innovation Solution
The implementation of a system that uses the Cubic Metric (CM) and Maximum Power Reduction (MPR) to dynamically adjust the switch points of multi-gain state power amplifiers based on the linearity characteristics of the transmit signal, allowing for more efficient switching between gain states and optimizing power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multi-gain state power amplifiers operate at fixed gain states with predetermined switch points, then device complexity is reduced and ease of operation is improved, but power consumption efficiency deteriorates and linearity performance worsens due to inability to adapt to different waveform characteristics
Solution Approach 1:
The patent implements dynamic gain state switching by continuously monitoring the cubic metric of the modulated signal and adjusting the power amplifier gain state in real-time. Unlike fixed switch point approaches, this dynamic adaptation allows the system to optimize power consumption based on actual waveform linearity characteristics, transitioning between gain states as the signal characteristics change during transmission.
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by adjusting the gain state selection based on the cubic metric value. When the cubic metric indicates high linearity requirements, the system selects lower gain states with higher linearity performance. When linearity requirements are lower, higher gain states are selected to maximize power efficiency, thus dynamically optimizing the parameter set based on signal characteristics.
2Power
If power amplifiers operate near maximum power output to maximize transmission distance, then transmission power is improved, but linearity performance deteriorates due to operation in non-linear region causing spectral re-growth
Solution Approach 1:
The patent employs feedback mechanisms by continuously calculating the cubic metric of the transmitted signal and using this information to adjust the power amplifier gain state. The cubic metric serves as a feedback parameter that indicates the linearity performance, and the system responds by selecting appropriate gain states to maintain acceptable spectral regrowth levels while maximizing transmission power when possible.
Solution Approach 2:
The system dynamically adjusts the operating point of the power amplifier based on real-time signal characteristics. Rather than operating at a fixed high power level, the system modulates the gain state dynamically according to the cubic metric, allowing temporary operation near maximum power when linearity requirements are satisfied, and retreating to lower power states when spectral regrowth becomes problematic.
3Use of energy by moving object
If power amplifiers use higher gain states to reduce power consumption at low power outputs, then power consumption is improved, but linearity performance deteriorates and adjacent channel leakage increases
Solution Approach 1:
The patent changes the operational parameters by selecting different gain states based on the cubic metric of the signal. When the cubic metric indicates that linearity is not critical, the system selects higher gain states to minimize power consumption. When the cubic metric shows that linearity requirements are stringent, the system transitions to lower gain states that provide better linearity performance, thus dynamically optimizing the trade-off between power consumption and adjacent channel leakage.
Solution Approach 2:
The system dynamically switches between gain states based on real-time monitoring of signal characteristics. Rather than being locked into a fixed gain configuration, the power amplifier adapts its gain state continuously as the signal's cubic metric changes, allowing the system to exploit higher gain states for power savings when linearity permits, and switching to lower gain states when adjacent channel leakage becomes a concern.
4Device complexity
If fixed switch points are used for gain state transitions, then device complexity is reduced, but adaptability to different waveform linearity characteristics deteriorates
Solution Approach 1:
The patent introduces adaptability by changing the switch point parameters dynamically based on the cubic metric of the transmitted signal. Instead of using fixed threshold values for gain state transitions, the system calculates the cubic metric and adjusts the switch points accordingly, allowing the same hardware to adapt to different waveform characteristics such as voice, data, or mixed traffic patterns without requiring multiple dedicated circuits.
Solution Approach 2:
The system transitions from static, fixed switch points to dynamic, adaptive switch points that respond to real-time signal characteristics. The cubic metric calculation provides the basis for dynamically adjusting when gain state transitions should occur, enabling the power amplifier to adapt to various waveform types and linearity requirements while using the same physical hardware, thus improving versatility without proportionally increasing complexity.
Data Source
AI summary
Techniques for optimizing the power consumption of existing low cost multi-gain state power amplifiers (PA) to increase the talk time of wireless communication devices are described. In an exemplary embodiment a device, such as a baseband processor, operates to set a multistage PA having at least two gain states for amplifying a transmit signal to a lowest power consuming gain state. The device calculates a transition power level as a function of an identified maximum power reduction (MPR) value and switches the PA to a higher gain state from a lower gain state when a transmission power level is higher than the calculated transition power level.