Wireless Circuitry Intermodulation Distortion Reduction
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Solution Overview
Problem
Operating wireless communications circuitry in electronic devices to simultaneously handle multiple communications bands, such as voice and data bands, is challenging due to potential interference from intermodulation distortion caused by nonlinear filter components, which can lead to dropped calls and reduced data transfer rates.
Innovation Solution
The implementation of wireless communications circuitry that includes a circulator and filtering components like bandpass filters, duplexers, and diplexers, which create sufficient isolation between nearby communications bands, using components such as Wilkinson splitters and passive combiners to route and multiplex signals effectively, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless circuitry operates multiple communications bands simultaneously, then communication versatility is improved, but intermodulation distortion increases causing interference
Solution Approach 1:
The wireless circuitry is divided into separate communication modules, each handling specific frequency bands independently. This segmentation allows simultaneous operation of multiple bands while isolating intermodulation distortion to individual modules, preventing cross-band interference and maintaining overall system versatility.
2Adaptability or versatility
If filter components are used to handle multiple bands, then band handling capability is improved, but nonlinearities in filters cause intermodulation distortion
Solution Approach 1:
An intermediary signal processing stage is introduced between the filter components and the antenna. This intermediary stage includes linearization circuits and adaptive equalizers that compensate for nonlinearities introduced by filters, allowing the system to maintain high band handling capability while reducing intermodulation distortion generation.
3Reliability
If interference from intermodulation distortion is reduced, then call stability is improved, but device complexity increases
Solution Approach 1:
The system dynamically adjusts operating parameters such as power levels, frequency offsets, and modulation schemes based on detected interference conditions. By changing these parameters in real-time, the system maintains call stability through adaptive optimization without requiring permanently complex circuitry, as the complexity is managed through software-controlled parameter adjustment.
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
This solution enables simultaneous operation of multiple communications bands without significant interference, ensuring stable voice calls and data communications by reducing intermodulation distortion and maintaining performance criteria.
Implementation Method 1
A circulator and filtering circuitry may be used to route signals from the transmitters to the antenna. Incoming signals that have been received by the antenna from an external source may be routed to the receivers by the circulator and filtering circuitry.
Implementation Method 2
The circulator and filtering circuitry may include components such as bandpass filters, duplexers, diplexers, and combiners formed from passive components.
Implementation Method 3
A diplexer or other filter may be interposed between the second port of the circulator and the antenna. The diplexer may route some incoming signals to the circulator and may route some incoming signals to an additional duplexer.
Implementation Method 4
Signals from the first and second transmitters may be merged onto a path that is coupled to the circulator using a duplexer, using a pair of respective bandpass filters and a passive combiner
Implementation Method 5
Signals from the first and second transmitters may be merged onto a path that is coupled to the circulator using a duplexer, using a pair of respective bandpass filters and a passive combiner such as a Wilkinson splitter
Data Source
AI summary
An electronic device has wireless communications circuitry that includes transmitters and receivers. The transmitters and receivers may share an antenna. Transmitted signals from multiple transmitters may be merged using a combining circuit. Merged signals from the transmitter may be conveyed to the antenna through a circulator. The circulator may route incoming signals from the antenna to receivers. The receivers may be coupled to the circulator through a filter. An additional filter may be interposed between the circulator and the antenna. An additional transmitter may transmit signals through the antenna using the additional filter. An additional receiver may receive some of the incoming signals that are received by the antenna through the additional filter.