Radio Frequency Module Phase-Shifting Switch Circuit for Path Isolation
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Solution Overview
Problem
Existing radio frequency modules face challenges in improving isolation between paths for different frequency bands, particularly in modes involving simultaneous transmission and reception.
Innovation Solution
A radio frequency module with a switch circuit and phase shifter configuration that allows for improved isolation between paths by using multiple switching elements and a phase shifter, enabling operation in modes that enhance signal transmission and reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch separates a first path for single mode and a second path for carrier aggregation mode, then mode-specific signal routing is achieved, but isolation between the first path and the second path deteriorates
Solution Approach 1:
The switch circuit is divided into multiple independent switching elements (first switching element, second switching element, third switching element, fourth switching element) that separately control the first path and the second path. Each switching element can be independently controlled to open or close specific paths, allowing mode-specific routing while maintaining isolation between paths through coordinated control of the segmented switching elements.
Solution Approach 2:
The second switching element and the fourth switching element act as intermediaries by providing ground connections to the first path and the second path respectively. These intermediary ground connections enhance isolation between the first path and the second path when both paths are simultaneously active, preventing harmful interference while maintaining the adaptability of mode-specific routing.
2Object-affected harmful factors
If multiple switching elements and ground connections are added to improve path isolation, then isolation between paths is improved, but device complexity increases
Solution Approach 1:
The switch circuit is designed with multi-functionality where the same switching elements and ground connections serve multiple purposes. The second switching element and fourth switching element not only provide ground references but also contribute to path isolation. This universal design achieves improved isolation without proportionally increasing complexity, as each added element serves multiple functional roles within the circuit.
Data Source
AI summary
Isolation between a first path and a second path is improved. A radio frequency module is capable of operating in a first mode in which simultaneous transmission, simultaneous reception, or simultaneous transmission and reception using both a first filter and a second filter is possible, and in a second mode in which transmission or reception using only the first filter is possible. A first switching element is provided in a first path that is usable between an antenna terminal and the first filter in the first mode, and a second switching element is provided between the first path and a ground. A third switching element is provided in a second path that is usable between the antenna terminal and the first filter in the second mode, and a fourth switching element is provided between the second path and the ground. The radio frequency module further includes a phase shifter.