Progressive Envelope Tracking Circuit With Delay Compensation
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Solution Overview
Problem
Current envelope tracking (ET) techniques in 5G-NR mobile communication devices face inefficiencies due to mismatched delays in signal paths, leading to suboptimal power management and reduced efficiency in RF power amplifiers, especially when resource blocks are low.
Innovation Solution
The implementation of a progressive ET integrated circuit (ETIC) that switches between driver amplifiers with different offset voltages and adjusts delays to synchronize changes in the offset voltage with the input signal, ensuring efficient tracking of the time-variant power envelope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust ET circuit is used to improve tracking accuracy, then power amplifier efficiency is improved, but power consumption increases and becomes inefficient when resource blocks are low
Solution Approach 1:
The ET circuit dynamically switches between different driver amplifiers with different offset voltages based on the input signal characteristics. This dynamic adaptation allows the circuit to maintain high tracking accuracy only when needed (high resource blocks) while consuming less power when resource blocks are low, resolving the contradiction between reliability and energy usage.
Solution Approach 2:
The system changes the offset voltage parameter by switching between different driver amplifiers. This parameter change enables the ET circuit to adapt its behavior to different operating conditions, achieving high tracking accuracy when resource blocks are abundant while reducing power consumption when resource blocks are scarce.
2Speed
If offset voltage changes are made quickly to track signal variations, then tracking responsiveness is improved, but delay mismatch with input signal increases
Solution Approach 1:
The system applies delay compensation to the input signal path in advance, ensuring that the signal arriving at the driver amplifier is time-aligned with the offset voltage changes. This preliminary action prevents delay mismatch from occurring, allowing fast tracking responsiveness without time loss.
Solution Approach 2:
The system uses feedback mechanisms to monitor and adjust the timing alignment between the input signal and offset voltage changes. By continuously monitoring the tracking performance and adjusting delays accordingly, the system maintains optimal responsiveness while minimizing delay mismatch.
Data Source
AI summary
A progressive envelope tracking (ET) with delay compensation includes an ET integrated circuit (IC) (ETIC) that is a progressive ETIC that switches between different driver amplifiers having different associated offset voltages based on a tracking signal (e.g., Vramp) from a baseband transceiver. To make sure that desired changes to the offset voltage occur contemporaneously with an input signal for the driver amplifiers, a delay may be added to the input signal for the driver amplifiers. By adding and controlling this delay to the input to the driver amplifiers, the changes to the offset voltage will track the changes to the input signal at the driver amplifiers and overall efficiency of the ETIC may be improved.