Multi-Level Supply Modulator Switching to Attenuate Transition Noise
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Solution Overview
Problem
In wireless communications devices, the high peak-to-average power ratio (PAPR) and high bandwidth of transmission/reception signals lead to reduced power efficiency in power amplifiers, necessitating average power tracking (APT) or envelope tracking (ET) technologies, but existing supply modulators face challenges in minimizing noise and maintaining efficient power management.
Innovation Solution
A supply modulator with a multi-level voltage generator, switch array, and switch controller that dynamically changes power voltages based on digital envelope signals, attenuating noise by outputting distinct voltage levels during specific frequency transitions, thereby minimizing power loss and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a supply modulator dynamically switches between different power voltage levels to track power efficiency, then power efficiency is improved, but noise is generated during voltage transitions
Solution Approach 1:
The patent applies preliminary action by introducing a delay period before the switch transitions to the next voltage level. During this delay period, the current voltage is maintained rather than immediately switching, which allows noise to settle before the next transition. This preliminary waiting period prevents noise accumulation and interference while preserving the power efficiency benefits of dynamic voltage tracking.
Solution Approach 2:
The patent implements periodic action by establishing a structured switching pattern with defined delay periods between voltage transitions. The switch controller operates periodically, transitioning between voltage levels at controlled intervals rather than continuously or randomly. This periodic switching with intentional pauses reduces noise generation while maintaining effective power tracking.
2Speed
If the switch transitions quickly between voltage levels to respond to power demands, then power efficiency tracking is improved, but noise and signal loss increase
Solution Approach 1:
The patent uses preliminary action by inserting a delay period before each voltage transition occurs. This delay allows the system to prepare for the transition in advance, ensuring that noise has time to decay and stabilize before the next switching event. The transition speed is effectively controlled not by rushing the switch but by strategically timing when transitions occur, maintaining responsiveness while reducing noise.
3Manufacturing precision
If multiple switches are used to provide multi-level voltage output, then voltage level precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the voltage output into multiple discrete levels, each controlled by a dedicated switch in the switch array. Instead of using a single complex variable voltage source, the system segments the voltage regulation into multiple fixed levels that can be independently controlled. This segmentation simplifies the control logic while achieving precise voltage level precision through the combination of multiple switches working in coordination.
Data Source
AI summary
A supply modulator includes a multi-level voltage generator configured to generate a plurality of power voltages having different voltage levels; a switch array including a plurality of switches respectively corresponding to the plurality of power voltages, and outputting one of the plurality of power voltages by activating connection of one of the plurality of switches; and a switch controller configured to control connection of each of the plurality of switches and activate connection of at least one third switch distinguished from a first switch and a second switch in response to receiving a level control signal switching the connection from the first switch to the second switch during a time period corresponding to a frequency to be attenuated between disconnecting the first switch and connecting the second switch.