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 switch points to account for waveform linearity differences, leading to inefficient power consumption and battery resource wastage, as they are typically optimized for voice or data usage without considering the specific linearity characteristics of the transmit waveform.
Innovation Solution
The implementation of a system that uses the Cubic Metric (CM) to dynamically adjust the switch points of multi-gain state power amplifiers, allowing them to switch between gain states based on the linearity characteristics of the transmit signal, thereby optimizing power consumption and reducing battery drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multi-gain state power amplifiers operate at fixed gain states with predetermined switch points, then device complexity is reduced and ease of manufacture is improved, but power consumption efficiency deteriorates due to inability to adapt to different waveform linearity characteristics
Solution Approach 1:
The patent implements dynamic adjustment of PA gain states by introducing a waveform linearity detector that continuously monitors the transmit waveform characteristics and dynamically switches between different gain states based on detected linearity levels. This transforms the fixed, static gain state operation into a dynamic system that adapts to real-time waveform conditions, resolving the contradiction between energy efficiency and device complexity by adding only minimal detection and control circuitry.
Solution Approach 2:
The patent changes the operating parameter of the power amplifier by adjusting the gain state selection based on waveform linearity characteristics. Instead of operating at fixed predetermined switch points, the system varies the gain state parameters dynamically according to the detected waveform properties, enabling optimal power consumption efficiency without requiring complex redesign of the amplifier architecture.
2Adaptability or versatility
If multi-gain state power amplifiers use predetermined switch points optimized for specific waveform types, then ease of operation is improved, but adaptability deteriorates due to inability to account for different waveform linearity characteristics
Solution Approach 1:
The patent implements a self-service mechanism where the power amplifier system automatically detects waveform linearity characteristics and autonomously selects appropriate gain states without requiring manual configuration or complex external control. The waveform linearity detector and control logic enable the system to serve itself by adapting to different waveform types automatically, thereby improving adaptability while maintaining ease of operation.
Solution Approach 2:
The patent introduces a feedback mechanism where the output waveform characteristics are continuously monitored and fed back to the gain state control logic. This feedback loop enables the system to adapt to different waveform linearity characteristics by adjusting gain states based on real-time performance information, resolving the contradiction between adaptability and ease of operation through automatic closed-loop control.
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.