Digital Wireless Transmitter Merged 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 with multiple supply voltages, leading to inefficiencies and signal distortions due to supply voltage mismatches.
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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Class-G technique with multiple supply voltages is used to increase resolution and power efficiency, then power efficiency and resolution are improved, but the technique is not available for sub-DPA cells with both amplitude and phase information because each sub-DPA cell has only one mixer that cannot process signals with different phase information at the same time
Solution Approach 1:
The patent segments the processing of amplitude and phase information into separate mixer paths. Each sub-DPA cell is divided into multiple mixers, where one mixer processes amplitude information and another mixer processes phase information. This segmentation allows the Class-G technique to be applied to cells handling both amplitude and phase signals simultaneously, resolving the limitation of conventional single-mixer cells.
Solution Approach 2:
The patent creates a universal sub-DPA cell structure that can handle both amplitude and phase information through multiple mixers. This multi-functional cell design allows the same cell to process different types of signal information (amplitude and phase) concurrently, making the Class-G technique applicable to a broader range of signal types including quadrature-modulated and multi-phase signals.
2Use of energy by moving object
If multiple supply voltages are used in Class-G operation, then energy efficiency is improved, but supply voltage mismatches cause signal distortions
Solution Approach 1:
The patent implements feedback mechanisms that monitor and adjust for supply voltage mismatches in real-time. By detecting voltage variations and compensating for them through control loops, the system maintains signal integrity while operating with multiple supply voltages, thus preserving both energy efficiency and signal quality.
Solution Approach 2:
The patent dynamically adjusts operating parameters such as supply voltage levels and mixer configuration based on signal conditions. By changing parameters adaptively, the system optimizes energy efficiency at different operating points while maintaining signal quality through coordinated parameter adjustment across multiple voltage domains.
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.