RF Switching Converter Average Frequency Control
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Solution Overview
Problem
RF switching converters face challenges due to manufacturing and operational variations, leading to degraded power efficiency and distortion, particularly in maintaining precise supply voltage control for Envelope Tracking (ET) and Average Power Tracking (APT) in RF amplification devices.
Innovation Solution
An RF switching converter with a switching controller that adjusts the average pulse frequency of a pulsed output voltage to match a target frequency, using a bang-bang controller and average frequency controller to correct for variations, and a ripple correction circuit to reduce supply voltage ripple variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RF switching converter operates without frequency correction, then device complexity is reduced, but manufacturing precision deteriorates due to manufacturing and operational variations
Solution Approach 1:
The switching controller incorporates an average frequency controller that continuously monitors the average pulse frequency of the pulsed output voltage and compares it against a target frequency. When deviations are detected due to manufacturing or operational variations, the controller automatically adjusts the switching circuit to correct the frequency, ensuring precise supply voltage control for envelope tracking and average power tracking functions.
2Loss of energy
If RF switching converter operates without frequency correction, then power efficiency is improved by simpler operation, but manufacturing precision deteriorates leading to degraded power efficiency
Solution Approach 1:
The average frequency controller provides continuous monitoring and correction of the switching frequency, ensuring that the pulsed output voltage maintains the correct average frequency despite manufacturing variations. This precision control prevents energy loss from distortion and ensures optimal power efficiency in the RF amplification device.
3Device complexity
If RF switching converter operates without frequency correction, then device complexity is reduced, but distortion increases due to inadequate supply voltage control
Solution Approach 1:
The switching controller uses feedback control to detect deviations in average pulse frequency and automatically adjusts the switching circuit to maintain the target frequency. This ensures precise supply voltage control for the RF amplification circuit, preventing signal distortion while maintaining adequate complexity only where necessary for correction.
4Device complexity
If RF switching converter operates without ripple correction, then device complexity is reduced, but noise increases due to ripple variations in supply voltage
Solution Approach 1:
The switching controller incorporates ripple correction functionality that monitors the supply voltage for ripple variations and adjusts the switching circuit operation to minimize ripple. This feedback mechanism reduces noise in the supply voltage without requiring excessive complexity, balancing performance and design simplicity.
Data Source
AI summary
This disclosure relates generally to radio frequency (RF) switching converters and RF amplification devices that use RF switching converters. For example, an RF switching converter may include a switching circuit that receives a power source voltage and a switching controller that receives a target average frequency value identifying a target average frequency. The switching circuit is switchable so as to generate a pulsed output voltage from the power source voltage. The switching controller switches the switching circuit such that the pulsed output voltage has an average pulse frequency. The switching controller also detects that the average pulse frequency of the pulsed output voltage during a time period differs from the target average frequency, and reduces a difference between the average pulse frequency and the target average frequency. In this manner, the effects of manufacturing variations and operational variations on the average pulse frequency can be eliminated, or at least diminished.