Power Amplifier Trimming via DPD Coefficients for Mobile RF Paths
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Solution Overview
Problem
Existing power amplifiers in RF communication systems face challenges in efficiently managing power and prolonging battery life, particularly in mobile devices, due to the need for precise control of RF signal amplification across various frequency ranges.
Innovation Solution
The proposed solution involves a mobile device transmit circuit that includes digital pre-distortion circuits, a coefficient comparator circuit for generating trimming control signals based on coefficients, and a power amplifier trimming circuit. This system provides digital pre-distortion to digital transmit signals, trims power amplifiers based on the trimming control signal, and transitions between modes to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital pre-distortion circuits are used for each digital transmit signal, then signal quality and power amplification precision are improved, but device complexity and power consumption increase
Solution Approach 1:
Multiple digital pre-distortion circuits are merged into a single shared circuit that serves multiple digital transmit signals. The coefficient comparator circuit compares coefficients from multiple power amplifiers and generates a single trimming control signal that is applied to trim all power amplifiers uniformly, reducing the number of separate pre-distortion circuits needed while maintaining power amplification precision across all signals.
Solution Approach 2:
A single digital pre-distortion circuit is designed to handle multiple digital transmit signals through the coefficient comparator circuit. The coefficient comparator performs multiple comparisons of coefficients from different power amplifiers and generates a universal trimming control signal that applies to all power amplifiers, making the pre-distortion functionality universal rather than dedicated to each individual signal.
2Measurement precision
If multiple digital pre-distortion circuits are used for each digital transmit signal, then power amplification accuracy is improved, but power consumption increases
Solution Approach 1:
Multiple power-consuming pre-distortion circuits are merged into one shared circuit that serves all digital transmit signals. The coefficient comparator circuit consolidates the function of multiple separate circuits by comparing coefficients from all power amplifiers and generating a single trimming control signal, thereby reducing the total number of active circuits and lowering overall power consumption while maintaining power amplification accuracy.
Solution Approach 2:
The coefficient comparator circuit automatically determines the appropriate trimming control signal by comparing coefficients from multiple power amplifiers, eliminating the need for separate control circuits for each amplifier. This self-service mechanism reduces power consumption by allowing a single pre-distortion circuit to serve multiple signals through intelligent coefficient comparison and unified control signal generation.
3Productivity
If power amplifier trimming is performed based on coefficient comparisons, then power management efficiency is improved, but device complexity increases
Solution Approach 1:
The coefficient comparator circuit implements feedback by continuously comparing coefficients from multiple power amplifiers and generating trimming control signals based on these comparisons. This feedback mechanism enables automatic power amplifier trimming that optimizes power management efficiency, as the system self-adjusts based on the measured coefficient differences without requiring complex external control logic.
Solution Approach 2:
The power amplifier trimming system performs self-service through the coefficient comparator circuit, which automatically compares coefficients and generates appropriate trimming control signals without requiring complex external intervention. The system uses its own internal coefficient data to determine the necessary trimming adjustments, simplifying the overall control architecture while improving power management efficiency.
Data Source
AI summary
Techniques for power amplifier trimming based on coefficients for digital pre-distortion (DPD) are disclosed. In certain embodiments, a mobile device includes a transceiver including a first DPD circuit that digitally pre-distorts a first digital transmit signal, a second DPD circuit that digitally pre-distorts a second digital transmit signal, and a coefficient comparator circuit that generates a trimming control signal based on comparing a first plurality of coefficients of the first DPD circuit to a second plurality of coefficients of the second DPD circuit. The mobile device further includes a front end system including a first power amplifier that amplifies a first radio frequency (RF) signal from the transceiver, a second power amplifier that amplifies a second RF signal from the transceiver, and a power amplifier trimming circuit that controls trimming of at least one of the first power amplifier or the second power amplifier based on the trimming control signal.