Power Amplifier LUT Control for Low-Power Cellular Transmission
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Solution Overview
Problem
Transceivers in cellular and wireless devices consume significant power due to the power amplifier's high current draw, which reduces battery life and is inefficient in meeting transmission standards, particularly in low power operation modes.
Innovation Solution
The transceiver employs different operation modes with adjustable power amplifier settings using look-up tables and techniques like average power tracking and envelope tracking to regulate power consumption, allowing for reduced power usage while maintaining transmission standards by adjusting bias levels, quiescent current, and radio-frequency gain indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power amplifier operates in normal power operation mode to exceed transmission standards by a certain margin, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts power amplifier operating parameters (bias current, supply voltage) based on real-time transmission requirements and channel conditions. The transceiver switches between normal and low power operation modes, and within each mode adjusts parameters dynamically to meet transmission standards while minimizing power consumption, rather than operating at fixed high power levels.
Solution Approach 2:
The invention changes key operating parameters of the power amplifier including bias current (Ib), supply voltage (Vdd), and back-off factor (BO) to optimize the trade-off between transmission reliability and power consumption. By adjusting these parameters based on transmission standards requirements, the system achieves compliant performance with reduced power usage.
2Reliability
If the power amplifier draws significant current to increase signal strength for better transmission, then transmission quality is improved, but battery life is reduced
Solution Approach 1:
The system implements dynamic power management that adjusts power amplifier current draw based on actual transmission needs. During periods of good channel conditions or when transmission standards are easily met, the system reduces current consumption. The transceiver monitors transmission quality and adaptively scales power consumption to maintain battery life while ensuring transmission quality requirements are met.
Solution Approach 2:
The system applies partial action by adjusting the back-off factor (BO) to operate the power amplifier at optimal points rather than always at maximum capacity. By using average power tracking and envelope tracking techniques, the system applies just enough power to meet transmission standards without excessive current draw, thereby extending battery life while maintaining transmission quality.
3Use of energy by moving object
If the transceiver uses average power tracking and envelope tracking to regulate power amplifier settings, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The system performs preliminary calibration to populate look-up tables (LUTs) with optimal power amplifier settings for various operating conditions. During normal operation, the transceiver simply queries these pre-computed LUTs based on current transmission requirements, avoiding complex real-time calculations. This preliminary action stores optimized parameters that guide power amplifier operation, reducing both power consumption and real-time processing complexity.
Solution Approach 2:
The invention introduces look-up tables (LUTs) as an intermediary structure that maps transmission requirements to optimal power amplifier settings. The LUTs serve as a pre-computed reference that simplifies the control logic, allowing the transceiver to regulate power consumption without implementing complex real-time optimization algorithms, thus balancing power savings with acceptable device complexity.
Data Source
AI summary
The representative embodiments discussed in the present disclosure relate to techniques in which the operating characteristics (e.g., power consumption) of a power amplifier in a transceiver may be regulated according to an operation mode of the transceiver. More specifically, in some embodiments, different LUTs may be employed for each mode of operation to suitably adjust the supply voltage (e.g., bias voltage) and/or quiescent current input to the power amplifier based on an input signal and a margin by which transmission standards are met. Further, in some embodiments, a method to calibrate a LUT for average power tracking and/or envelope tracking in a transceiver mode of operation may be employed to populate a LUT that may be used to suitably adjust the power and/or current consumption of the power amplifier.