Power Amplifier Supply Control with Post-PA Detection Loops
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Solution Overview
Problem
Handheld wireless communication devices face significant power consumption issues due to large power drain from power amplifiers in transmitters, leading to reduced battery life, especially when operating on multiple transmission bands, and existing control methods for switched mode power supplies are inefficient and complex.
Innovation Solution
Implementing a power management block with a switching regulator control block and a switched mode power supply that actively controls the supply voltage to power amplifiers based on detected transmission signals, using a switching control transfer function to stabilize the control loop and minimize excess headroom, allowing for efficient power amplification across multiple bands with reduced hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a switched mode power supply is used to reduce power consumption, then energy efficiency is improved, but control complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the output power of the power amplifier is detected and fed back to the switching regulator control block. This closed-loop feedback system automatically adjusts the supply voltage to maintain optimal power efficiency without requiring complex manual control, thereby resolving the contradiction between energy efficiency and control complexity.
Solution Approach 2:
The power management system performs self-adjustment by automatically detecting output power levels and regulating supply voltage through the switching regulator. This self-service capability eliminates the need for external complex control mechanisms, achieving both energy efficiency and simplified control.
2Loss of energy
If fixed-step control technique is used for switched mode power supply, then power efficiency is improved, but adaptability to varying transmission conditions deteriorates
Solution Approach 1:
The patent transitions from fixed-step control to dynamic control by continuously monitoring output power and adjusting supply voltage in real-time. This dynamic adaptation allows the system to maintain optimal power efficiency across varying transmission conditions, bandwidths, and power levels, resolving the contradiction between efficiency and adaptability.
Solution Approach 2:
The system dynamically changes the supply voltage parameter based on detected output power levels and transmission conditions. By continuously adjusting this critical parameter, the system achieves both high power efficiency and adaptability to different operating scenarios.
3Adaptability or versatility
If continuous control technique is used for switched mode power supply, then adaptability is improved, but power efficiency deteriorates
Solution Approach 1:
The patent employs periodic switching action in the switched mode power supply, where the supply voltage is adjusted in discrete switching cycles rather than continuous variation. This periodic control maintains adaptability to changing conditions while preserving the high efficiency characteristics of switched mode operation, resolving the contradiction between adaptability and efficiency.
4Reliability
If excess headroom is maintained in power amplifier, then reliability is improved, but energy waste increases
Solution Approach 1:
The system dynamically adjusts the supply voltage parameter to maintain an optimal balance between headroom and efficiency. By continuously monitoring output power and adjusting voltage accordingly, the system ensures sufficient headroom for reliable operation while minimizing excess energy consumption during low-power transmission modes.
Solution Approach 2:
The patent implements dynamic headroom management where the supply voltage and resulting headroom adapt to current transmission requirements. This dynamic approach maintains adequate headroom for reliability when needed while reducing headroom and energy consumption during normal operation, resolving the contradiction between reliability and energy efficiency.
Data Source
AI summary
Various embodiments described herein relate to a power management block and one or more amplification blocks used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier, both of which are included in a selected one of the amplification blocks. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values. Post power amplifier transmission power is detected for input into the one or more feedback loops executed in the power management block. A controller for the power amplifier is design to stabilize the system with respect to gain expansion in the power amplifier.