Envelope Tracking Transceiver Noise-Efficiency Tradeoff Control

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Solution Overview

Problem

Existing envelope tracking systems in radio frequency transceivers face challenges in achieving optimal noise performance and power efficiency, as they often require trade-offs between these two parameters, and existing solutions do not effectively manage noise generation and filtering in the receive band.

Innovation Solution

The proposed envelope tracking transceiver dynamically adjusts parameters such as supply voltage and compression levels based on noise margin estimates, using a lookup table and feedback mechanisms to optimize power efficiency while controlling noise levels, allowing for better noise performance or efficiency depending on operational conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If envelope tracking operates the power amplifier with low headroom to improve power efficiency, then power efficiency is improved, but noise performance deteriorates

Engineering Contradiction:

Improvepower efficiencyVSAvoidnoise performance

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the supply voltage to the power amplifier based on real-time noise margin measurements. The configuration circuit modifies envelope tracking parameters adaptively, transitioning between low headroom (high efficiency) and higher headroom (low noise) operation modes according to channel conditions, thereby resolving the static trade-off between efficiency and noise performance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the operating parameters of the power amplifier by adjusting the supply voltage headroom based on noise margin conditions. When noise margin is sufficient, the system operates with low headroom for maximum efficiency; when noise margin is insufficient, the system increases headroom to reduce noise, thus dynamically optimizing the parameter to resolve the contradiction

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If envelope tracking uses dynamic supply voltage to track modulation amplitude, then power efficiency is improved, but noise generation in receive band increases

Engineering Contradiction:

Improvepower efficiencyVSAvoidnoise generation

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The system employs a feedback mechanism where the receiver measures the noise margin of the received signal and feeds this information back to the configuration circuit. This feedback loop enables the system to adjust the envelope tracking parameters to minimize noise generation in the receive band while maintaining power efficiency, directly addressing the harmful noise generation issue

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The invention converts the potentially harmful noise generation effect into a controllable parameter by measuring noise margin and using it to adjust operating conditions. The noise issue is transformed from an unavoidable byproduct into a manageable variable that can be optimized along with efficiency through adaptive parameter adjustment

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP2974005B1Et system with adjustment for noise

Publication Date: 2018.06.20 QUANTANCE INC

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AI summary

An envelope tracking transceiver dynamically adjusts envelope tracking parameters to achieve the desired tradeoff between noise performance and power efficiency. When higher levels of noise are acceptable, the envelope tracking transceiver dynamically adjusts transmitter parameters to achieve better power efficiency while sacrificing noise performance. When lower levels of noise are desired, the envelope tracking transceiver dynamically adjusts parameters to achieve better noise performance while sacrificing efficiency.