Average power tracking power management circuit
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Solution Overview
Problem
Current power management integrated circuits (PMICs) face challenges in adapting average power tracking (APT) voltages for Wi-Fi power amplifiers within tight temporal limits, such as 0.5 microseconds, to maintain linearity and efficiency, especially when supporting multiple radio frequency bands and legacy technologies like 3G and 4G, as well as local area networking technologies like Wi-Fi.
Innovation Solution
The proposed APT power management circuit employs a pair of switcher circuits to generate reference voltages, which can be selectively output as APT voltages, allowing flexible configuration to support various operating scenarios with a minimum number of switcher circuits, reducing footprint and cost, and includes hybrid circuits and a control circuit to manage voltage outputs efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switcher circuits are used to generate APT voltages for different power amplifiers, then voltage adaptability improves, but circuit footprint and cost increase
Solution Approach 1:
The patent implements a universal switcher circuit design where a single switcher circuit can generate reference voltages that are selectively distributed to multiple power amplifiers through hybrid circuits. This multi-functional approach allows one switcher circuit to serve multiple purposes, replacing what would traditionally require separate switcher circuits for each power amplifier, thereby reducing overall circuit footprint while maintaining full voltage adaptability across all amplifiers.
Solution Approach 2:
The patent merges multiple voltage generation functions into a single integrated switcher circuit. By combining the reference voltage generation capabilities and selectively coupling them to different power amplifiers through controlled hybrid circuits, the design consolidates what would be separate voltage supply systems into one unified structure, reducing total component count and circuit area.
2Speed
If switcher circuits are used to generate reference voltages, then voltage adaptation speed improves, but circuit complexity increases
Solution Approach 1:
The patent segments the voltage adaptation function into two distinct parts: a switcher circuit responsible for generating reference voltages and hybrid circuits responsible for distributing and conditioning these voltages to specific power amplifiers. This segmentation allows the switcher circuit to focus on fast voltage generation while the hybrid circuits handle the selective distribution, thereby achieving fast adaptation without requiring every component to be complex.
Solution Approach 2:
The hybrid circuits serve as intermediary components between the switcher circuit and the power amplifiers. These intermediaries receive reference voltages from the switcher circuit and selectively couple them to the appropriate power amplifiers based on operational requirements. This intermediary layer simplifies the overall control architecture by decoupling the voltage generation function from the voltage distribution function.
3Loss of energy
If APT voltage adaptation is performed within tight temporal limits, then power amplifier efficiency improves, but control precision requirements increase
Solution Approach 1:
The switcher circuit performs preliminary action by pre-generating reference voltages before they are needed by the power amplifiers. This advance preparation of voltage levels allows the system to quickly respond to changing operational conditions without requiring complex real-time voltage synthesis, thereby achieving fast adaptation with manageable control precision requirements.
Data Source
AI summary
An average power tracking (APT) power management circuit is provided. The APT power management circuit is configured to generate a first APT voltage(s) for a first power amplifier(s) and a second APT voltage(s) for a second power amplifier(s). The APT power management circuit further includes a pair of switcher circuits that can generate a pair of reference voltages. Depending on various operating scenarios of the APT power management circuit, it is possible to selectively output any of the reference voltages as any one or more of the first APT voltage(s) and the second APT voltage(s). As such, it is possible to flexibly configure the APT power management circuit to support the various operating scenarios based on a minimum possible number of the switcher circuits, thus helping to reduce footprint and cost of the APT power management circuit.