Dual-band Radio Frequency Circuit with Segmented Low-noise Amplifiers

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Solution Overview

Problem

In dual connectivity scenarios, existing radio frequency circuits often experience connection failures and deteriorated reception sensitivity, particularly when amplifying signals from secondary base stations.

Innovation Solution

A radio frequency circuit design that includes two low-noise amplifiers, each connected to filters with specific passbands covering different frequency bands, allowing for improved signal amplification and separation in dual connectivity environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single low-noise amplifier is used for dual connectivity, then device complexity is reduced, but connection reliability deteriorates due to insufficient signal amplification for secondary base stations

Engineering Contradiction:

Improvenumber of low-noise amplifiersVSAvoidconnection reliability in dual connectivity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the signal amplification function into separate low-noise amplifiers for different frequency bands. The first low-noise amplifier handles the first frequency band while the second low-noise amplifier handles the second frequency band, allowing each amplifier to be optimized for its specific band and ensuring adequate signal amplification for secondary base stations without overloading a single amplifier.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If a single low-noise amplifier amplifies signals from both base stations, then device complexity is reduced, but reception sensitivity deteriorates due to insufficient amplification gain for secondary base station signals

Engineering Contradiction:

Improvenumber of low-noise amplifiersVSAvoidreception sensitivity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent segments the amplification function by frequency band, with the second low-noise amplifier specifically dedicated to amplifying signals from the second base station. This ensures that signals requiring high amplification gain, such as those from secondary base stations, receive adequate boost while maintaining reception sensitivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each low-noise amplifier is designed with specific characteristics optimized for its target frequency band. The second low-noise amplifier is specifically configured to provide appropriate amplification gain for the second frequency band, ensuring that reception sensitivity is maintained for signals requiring enhanced amplification.

Inventive Principle:

Principle #3Local quality

3Device complexity

If frequency bands are not properly separated, then device complexity is reduced, but harmful factors increase due to signal interference between bands

Engineering Contradiction:

Improvefilter configurationVSAvoidsignal interference between frequency bands

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces filters that segment the frequency spectrum into distinct passbands. The first filter passes signals from the first base station while the second filter passes signals from the second base station, preventing frequency band overlap and signal interference between the two communication links.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filters act as intermediary elements between the antenna and the low-noise amplifiers, selectively passing specific frequency bands and blocking others. This mediation prevents harmful signal interference by ensuring that only the intended frequency band signals reach their respective amplifiers.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed solution effectively reduces connection failures and enhances reception sensitivity in dual connectivity by ensuring adequate amplification of signals from secondary base stations, while also optimizing power consumption and protecting RFIC components from excessive signal levels.

Implementation Method 1

a first low-noise amplifier; a second low-noise amplifier

Methodology Applied

Scientific EffectLow-noise amplification:

Implementation Method 2

a first filter connected between an output end of the first low-noise amplifier and the first output terminal, the first filter having a passband that includes at least a portion of a first band

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Implementation Method 3

a second filter connected between the output end of the first low-noise amplifier and the second output terminal, the second filter having a passband that includes at least a portion of a second band

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Data Source

PatentUS20250125828A1Radio frequency circuit

Publication Date: 2025.04.17 MURATA MFG CO LTD

AI summary

A radio frequency circuit includes: a first output terminal; a second output terminal; a first low-noise amplifier; a second low-noise amplifier; a first filter connected between an output end of the first low-noise amplifier and the first output terminal, the first filter having a passband that includes at least a portion of a first band; and a second filter connected between the output end of the first low-noise amplifier and the second output terminal, the second filter having a passband that includes at least a portion of a second band. The second low-noise amplifier is connected between the second filter and the second output terminal, and the first band and the second band are a combination of bands usable in dual connectivity.