Full Duplexer Distortion Cancellation for Receive Band Leakage

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Solution Overview

Problem

Existing technologies face challenges in addressing distortion and interference with a duplexers, specifically in addressing distortion and interference with a duplexers, specifically in addressing the distortion and interference with a duplexers, and interference with a duplexers.

Innovation Solution

Implement a duplexer to reduce receive band leakage by sensing, at a full duplexer, passive intermodulation (PIM) distortion and power amplifier (PA) distortion, and generate a PIM distortion and PA distortion cancellation signal to cancel these distortions on the receive path.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a duplexer is used to allow bi-directional communication over a shared port, then device complexity is reduced, but receive band leakage and distortion (PIM and PA distortion) increase

Engineering Contradiction:

Improveduplexer structureVSAvoidreceive band leakage

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent captures the harmful distortion signals (PIM and PA distortion) that leak into the receive band and converts them into useful cancellation signals. By sensing these distortion components and generating corresponding cancellation signals, the system eliminates the harmful effects of receive band leakage while maintaining the simplified duplexer structure.

Inventive Principle:

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

Solution Approach 2:

The patent implements a feedback mechanism where the duplexer senses its own distortion outputs (PIM and PA distortion) and generates cancellation signals based on these sensed values. This closed-loop feedback allows the system to continuously monitor and correct receive band leakage, resolving the contradiction between structural simplicity and signal purity.

Inventive Principle:

Principle #23Feedback

2Object-generated harmful factors

If distortion cancellation signals are generated and applied, then receive band leakage is reduced, but device complexity increases

Engineering Contradiction:

ImprovePIM distortion and PA distortionVSAvoidsignal processing system

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent designs a processing device that performs multiple functions: it senses distortion signals, generates cancellation signals, and applies corrections all within a single integrated system. This multi-functional approach reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while achieving effective distortion cancellation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the duplexer operates with high power to maintain signal strength, then transmission quality improves, but power consumption increases

Engineering Contradiction:

Improvesignal transmission qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful distortion byproducts of high-power operation into useful cancellation signals. By sensing and canceling PIM and PA distortion, the system maintains signal transmission quality at high power levels without the harmful effects of distortion, effectively decoupling transmission quality from excessive power consumption.

Inventive Principle:

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

Data Source

PatentUS20250373404A1Reducing receive band leakage in a duplexer

Publication Date: 2025.12.04 MAXLINEAR INC

AI summary

A method for reducing receive band leakage may include: sensing, at a full duplexer, passive intermodulation distortion and power amplifier distortion; generating, at a processing device, a passive intermodulation distortion and power amplifier distortion cancellation signal; and cancelling, on a receive path, the passive intermodulation distortion and power amplifier distortion using the passive intermodulation distortion and power amplifier distortion cancellation signal.