RF Multiplexer LNA Circuit Tuning for Carrier Aggregation Bands
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Solution Overview
Problem
Carrier aggregation in communication devices requires improved signal processing quality due to varying connection states between receiving ports and circuits, which is affected by differences in frequency bands and line lengths, leading to inconsistent performance.
Innovation Solution
A semiconductor device with a configuration that includes multiple LNAs, receiving circuits, and an RF multiplexer, utilizing variable capacitors and transformers to compensate for inductance differences caused by line lengths and adjust signal processing based on frequency bands, ensuring optimal signal processing performance across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple receiving circuits are connected to multiple LNAs through an RF multiplexer, then carrier aggregation capability is enabled and data transmission rate is improved, but signal processing quality varies depending on connection state between receiving ports and circuits
Solution Approach 1:
The patent applies parameter changes by introducing variable capacitors that can adjust their capacitance values based on the specific connection state between LNAs and receiving circuits. This allows the system to optimize signal processing quality for different frequency bands and connection configurations, resolving the contradiction between maintaining high data transmission rates through carrier aggregation and ensuring consistent signal processing quality across varying connection states
Solution Approach 2:
The patent implements dynamics by making the receiving circuit configuration adaptable through switchable capacitor connections. The system can dynamically reconfigure the receiving circuits based on which LNAs are active and which frequency bands are being used, allowing optimal signal processing for each operational state while maintaining carrier aggregation capability
2Adaptability or versatility
If receiving circuits are designed to support all frequency bands for carrier aggregation, then adaptability to different frequency bands is improved, but line length differences cause inductance variations that degrade signal processing performance
Solution Approach 1:
The patent uses parameter changes by incorporating variable capacitors with different capacitance values that can be switched based on the operating frequency band. This compensates for the inductance variations caused by different line lengths to various receiving circuits, ensuring consistent signal processing performance across all supported frequency bands while maintaining broad frequency band adaptability
Solution Approach 2:
The patent applies local quality by providing different capacitor configurations for different receiving circuits based on their specific line length characteristics and distance from the RF multiplexer. Each receiving circuit can be locally optimized for its specific connection state, allowing the system to maintain high signal processing performance across all frequency bands despite varying line lengths
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 solution enhances signal processing performance by minimizing the impact of line length variations and frequency band changes, resulting in improved reception gain and sensitivity across various frequency bands.
Implementation Method 1
a first variable capacitor having a first end connected to an output of the RF multiplexer and a second end connected to the first transformer
Implementation Method 2
a first receiving circuit including a first transformer and configured to process at least one of outputs of the first and second LNAs
Data Source
AI summary
A semiconductor device includes a first Low Noise Amplifier (LNA), a second LNA, first and second receiving circuits, an a radio frequency multiplexer. The first LNA is connected to a first receiving port, and the second LNA is connected to a second receiving port different from the first receiving port. The first receiving circuit includes a first transformer and processes one or more outputs of the first and second LNAs. The second receiving circuit processes one or more of the outputs of the first and second LNAs. The radio frequency multiplexer controls connection between the first and second LNAs and the first and second receiving circuits. The first receiving circuit includes a first variable capacitor having a first end connected to an output of the radio frequency multiplexer and a second end connected to the first transformer.