Intra-Symbol Voltage Modulation Circuit for RF Envelope Tracking
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Solution Overview
Problem
In 5G-NR systems, the time-variant power of RF signals within OFDM symbols poses a challenge for power management integrated circuits (PMICs) to adapt modulated voltages without causing distortion, such as amplitude clipping, due to the need for precise voltage adjustments within the cyclic prefix of each symbol.
Innovation Solution
A transceiver circuit divides voltage modulation intervals into multiple subintervals, allowing a PMIC to adapt modulated voltages multiple times based on specific targets, closely tracking the time-variant power envelope of RF signals to prevent distortion during amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PMIC adapts modulated voltage once per OFDM symbol duration, then the device complexity is reduced, but the voltage cannot timely track the time-variant power envelope causing signal distortion
Solution Approach 1:
The patent segments the voltage modulation interval into multiple subintervals, with each subinterval having its own voltage target. This allows the PMIC to adapt voltage multiple times within a single OFDM symbol duration, enabling timely tracking of the time-variant power envelope while avoiding signal distortion.
2Measurement precision
If the PMIC adapts modulated voltage multiple times within voltage modulation interval, then the voltage tracking precision is improved, but the device complexity increases
Solution Approach 1:
The voltage modulation interval is divided into multiple subintervals, each with specific voltage targets. This segmentation enables precise voltage tracking at multiple points within the interval, improving the ability to follow the time-variant power envelope while maintaining manageable complexity through structured subinterval management.
Data Source
AI summary
Circuit and method for intra-symbol voltage method are disclosed. In an embodiment, a transceiver circuit is configured to divide a voltage modulation interval(s) (e.g., a symbol duration) into multiple voltage modulation subintervals each corresponding to a respective one of multiple voltage targets. Accordingly, a power management integrated circuit (PMIC) can adapt a modulated voltage multiple times within the voltage modulation interval(s) based on multiple voltage targets, respectively. By adapting the modulated voltage within the voltage modulation interval(s), the modulated voltage can be timely adapted to closely track a time-variant power envelope of a radio frequency (RF) signal to thereby avoid potential distortion (e.g., amplitude clipping) during amplification of the RF signal.