Wireless Power Amplifier Cell Switching for Class-G Linearity
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Solution Overview
Problem
Conventional digital power amplifiers (DPAs) face challenges in processing both amplitude and phase information simultaneously, especially in Class-G operations, leading to inefficiencies and signal distortions due to supply voltage mismatches, which affect linearity and energy efficiency in multi-standard wireless communication systems.
Innovation Solution
The proposed solution involves a merged cell switching (MCS) technique that employs vector amplitude switching (VAS) and vector phase switching (VPS) to distribute and conserve input vectors across multiple amplifier cells, enabling efficient Class-G operation with dual-supply voltages and minimizing distortion, while using a quadrature IQ-Cell shared switched-capacitor power amplifier (SCPA) architecture to achieve higher linearity and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional Class-G technique with multiple supply voltages is used to increase resolution and power efficiency, then power efficiency is improved, but it cannot process signals with different phase information simultaneously because each sub-DPA cell has only one mixer
Solution Approach 1:
The patent divides the signal processing function into two separate mixers within each sub-DPA cell: a primary mixer for amplitude information and a secondary mixer for phase information. This segmentation allows independent processing of amplitude and phase signals, enabling the system to handle quadrature-modulated signals while maintaining Class-G power efficiency.
Solution Approach 2:
The sub-DPA cell is designed with multi-functionality by incorporating both primary and secondary mixers, allowing it to process both amplitude and phase information simultaneously. This universal design enables the same cell structure to handle various modulation schemes including QAM and PSK while operating in Class-G mode.
2Measurement precision
If multiple supply voltages are used in Class-G operation, then resolution and power efficiency are improved, but supply voltage mismatches cause signal distortions affecting linearity
Solution Approach 1:
The patent implements feedback mechanisms through digital correction circuits that detect and compensate for supply voltage mismatches. The system monitors the actual supply voltages applied to different sub-DPA cells and uses digital signal processing to correct the resulting phase and amplitude distortions, thereby maintaining high linearity despite using multiple supply voltages for improved resolution.
Solution Approach 2:
The system dynamically adjusts operating parameters including supply voltage levels, mixing frequencies, and digital correction coefficients to optimize both resolution and linearity. By changing these parameters adaptively based on operating conditions, the system maintains high measurement precision while compensating for voltage mismatches that would otherwise degrade linearity.
3Area of stationary object
If unit cells are merged to improve energy efficiency and reduce area, then area and power consumption are reduced, but the ability to process multiple input vectors simultaneously is limited
Solution Approach 1:
The patent segments the signal processing function into distinct primary and secondary mixer paths within each merged unit cell. This functional segmentation allows the cell to process multiple input vectors simultaneously by directing amplitude information through the primary mixer and phase information through the secondary mixer, thereby maintaining high processing throughput while benefiting from the area savings of cell merging.
Solution Approach 2:
The patent adds a temporal dimension to signal processing by implementing time-division multiplexing control for the primary and secondary mixers. Different input vectors are processed in different time slots within the same unit cell, effectively increasing productivity without requiring additional physical cells, thus maintaining area efficiency while enhancing processing capability.
Data Source
AI summary
A vector distribution method for operation of a power amplifier of a wireless transmitter including receiving, by a first amplifier circuit, a first input vector and a second input vector. The first input vector includes data derived from an input signal of the wireless transmitter and the second input vector includes other data derived from the input signal of the wireless transmitter. The method includes, in response to receiving the input signal, instructing the first amplifier circuit to output an output signal at a high voltage.