Antenna Switch Diversity Circuitry for Intermodulation Isolation
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Solution Overview
Problem
In non-standalone architecture for broadband cellular network technology, where both 4G and 5G standards coexist, CMOS switches produce intermodulation distortion signals due to nonlinear on-resistance characteristics, affecting signal reliability and compliance with regulatory requirements.
Innovation Solution
The implementation of antenna switch diversity circuitry with multiple switches, configured to prevent signals from different transmitters from being conveyed through the same switch, reducing intermodulation distortion by using control signals to manage the switching of antennas and transmitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmitters operate simultaneously through shared switches in non-standalone architecture, then device functionality and signal coverage are improved, but intermodulation distortion signals are generated due to nonlinear on-resistance characteristics
Solution Approach 1:
The patent applies preliminary action by controlling the switches to prevent signals from different transmitters from being conveyed through the same switch simultaneously. The control mechanism proactively manages switch states based on which transmitter is active, preventing the intermodulation distortion from occurring in the first place rather than attempting to filter or correct it afterward.
2Device complexity
If signals from different transmitters are routed through the same switch, then device complexity is reduced, but signal reliability deteriorates due to intermodulation distortion
Solution Approach 1:
The control mechanism proactively manages switch states to prevent intermodulation distortion before it occurs, ensuring signal reliability is maintained without requiring complex filtering or correction circuitry afterward.
Data Source
AI summary
Antenna switch diversity circuitry can include four switches. A first switch can be connectable to a first transmitter, a first receiver, and a second receiver. A second switch can be connectable to a second transmitter, a third receiver, and a fourth receiver. A third switch can be directly connected to the first switch, the second switch, a first antenna, and a second antenna. A fourth switch directly can be connected to the first switch, the second switch, a third antenna, and a fourth antenna. The first and second switches can be configured to be controlled by a control signal in a manner so as to prevent a signal from the first transmitter and a signal from the second transmitter from being conveyed through a same switch, which can reduce a production of an intermodulation distortion signal by the signal from the first transmitter and the signal from the second transmitter.