Dual RF Circuit Wireless Chip for WLAN-BT Interference Isolation
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Solution Overview
Problem
Existing wireless communication chips face interference between WLAN and BT signals, leading to poor efficiency and sensitivity when both functions are simultaneously executed.
Innovation Solution
The wireless communication chip incorporates a first and second radio frequency circuit with distinct impedance values and a switch unit to selectively adjust signal processing based on the wireless transmission technology, using oscillators, variable resistors, and capacitors to minimize leakage current and enhance sensitivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless communication chip simultaneously executes WLAN function and BT communication function, then the chip can provide multi-functionality, but the WLAN signal and BT signal interfere with each other causing poor efficiency and sensitivity
Solution Approach 1:
The patent segments the radio frequency circuit into two independent circuits: a first radio frequency circuit for WLAN function and a second radio frequency circuit for BT communication function. Each circuit has its own amplifier stage, mixer, and baseband processing components. This segmentation prevents signal interference between WLAN and BT while maintaining multi-functionality, as each circuit processes its respective signal independently without mutual interference.
2Device complexity
If the chip uses a single radio frequency circuit for both WLAN and BT, then the device complexity is reduced, but signal interference occurs between the two technologies
Solution Approach 1:
The patent divides the radio frequency circuit into separate first and second circuits, each dedicated to a specific wireless technology (WLAN or BT). This segmentation physically isolates the signal paths, eliminating mutual interference while maintaining manageable complexity through modular design where each circuit follows a similar structural pattern.
Solution Approach 2:
The patent applies local quality by giving each radio frequency circuit specialized characteristics optimized for its specific function. The first circuit is optimized for WLAN with appropriate impedance values and filtering, while the second circuit is optimized for BT communication. This localized optimization ensures each circuit performs its specific function with high efficiency without being compromised by the requirements of the other technology.
3Measurement precision
If the chip improves sensitivity for one wireless technology, then the performance for that technology is enhanced, but the performance for the other technology deteriorates due to shared resources
Solution Approach 1:
The patent segments the signal processing resources into separate first and second circuits, allowing each circuit to be independently optimized for its specific wireless technology. The first circuit can achieve high sensitivity for WLAN without compromising BT performance, as the second circuit maintains dedicated resources for BT communication. This segmentation enables both circuits to operate at peak performance simultaneously.
Solution Approach 2:
The patent employs parameter changes by adjusting impedance values, filtering characteristics, and amplifier gain settings specifically for each radio frequency circuit based on its designated function. The first circuit uses parameters optimized for WLAN frequency ranges and modulation schemes, while the second circuit uses parameters tailored for BT communication requirements, enabling each to achieve maximum sensitivity for its specific technology.
Data Source
AI summary
A wireless communication chip includes an amplifier stage, a first radio frequency circuit, and a second radio frequency circuit. The amplifier stage is configured to receive and amplify a radio frequency signal. The first radio frequency circuit includes a mixer, a baseband transconductor, an output stage, and a switch unit. The mixer is configured to receive an oscillation signal and the radio frequency signal from the amplifier stage, and is configured to adjust a frequency of the radio frequency signal based on the oscillation signal. The switch unit is electrically connected between an input terminal of the baseband transconductor and an output terminal of the baseband transconductor. The first radio frequency circuit and the second radio frequency circuit support different wireless transmission technologies, and are jointly coupled to an output terminal of the amplifier stage.