RF Transceiver Target Voltage Control for ACLR Ripple Suppression
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Solution Overview
Problem
Existing transceiver circuits suffer from degraded adjacent channel leakage ratio (ACLR) due to voltage ripple in power amplifier circuits, particularly in lower power ranges, which is not effectively addressed by current envelope tracking and average power tracking techniques.
Innovation Solution
A transceiver circuit that adapts target voltage generation based on the power range of the RF signal, using high and low power-range lookup tables to suppress voltage ripple, ensuring the equalizer circuit operates across a dynamic power range to cancel ripple voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If envelope tracking or average power tracking techniques are used to improve power amplifier efficiency, then power management is improved, but voltage ripple occurs that degrades ACLR performance
Solution Approach 1:
The patent segments the power range into multiple discrete levels (e.g., first power range, second power range, third power range). For each segment, a specific target voltage is applied. This segmentation allows the system to optimize power amplifier efficiency at each level while avoiding the voltage ripple that occurs with continuous envelope tracking, thereby resolving the contradiction between efficiency improvement and ripple suppression.
Solution Approach 2:
The patent employs periodic switching between different target voltages corresponding to different power ranges. Instead of continuous voltage modulation, the system periodically switches between discrete voltage levels based on the RF signal power range. This periodic action maintains power amplifier efficiency while eliminating the continuous voltage ripple that degrades ACLR performance.
2Device complexity
If a single target voltage is used across all power ranges, then device complexity is reduced, but ACLR performance degrades in lower power ranges due to voltage ripple
Solution Approach 1:
The patent implements a dynamic target voltage selection mechanism that adapts to different RF signal power ranges. The system dynamically switches between multiple target voltages based on the current power range, rather than using a fixed single voltage. This dynamic adaptation eliminates voltage ripple in lower power ranges while maintaining manageable device complexity through systematic voltage selection.
Solution Approach 2:
The patent changes the target voltage parameter based on the RF signal power range. By adjusting the target voltage parameter to match appropriate levels for different power ranges (e.g., higher target voltage for higher power ranges, lower or zero target voltage for lower power ranges), the system eliminates voltage ripple without requiring overly complex generation circuitry.
3Power
If power range is increased to handle higher power signals, then communication capability is improved, but voltage ripple increases causing ACLR degradation
Solution Approach 1:
The patent segments the wide power range into multiple discrete power ranges, each associated with a specific target voltage. This segmentation allows the system to handle high power signals (improving communication capability) while applying appropriate target voltages for each segment to prevent voltage ripple generation, thus resolving the contradiction between power capability and ripple suppression.
Solution Approach 2:
The patent applies different target voltage qualities to different power ranges. For each local power range, an optimized target voltage is selected that is appropriate for that specific operating condition. This local quality approach ensures that voltage ripple is suppressed in each power range while maintaining the overall wide power range capability for enhanced communication.
Data Source
AI summary
A transceiver circuit operable in a dynamic power range is provided. In embodiments disclosed herein, the transceiver circuit is configured to generate a radio frequency (RF) signal and a target voltage that is adapted according to a power range of the RF signal. More specifically, the transceiver circuit is configured to generate the target voltage differently when the power range of the RF signal is higher (e.g., ≥18 dBm) or lower (e.g., <18 dBm). By adapting the target voltage based on the power range of the RF signal, it is possible to suppress a potential voltage ripple in a modulated voltage generated according to the target voltage to thereby achieve a desired adjacent channel leakage ratio (ACLR) when the RF signal is amplified at a power amplifier circuit based on the modulated voltage.