RF Antenna Switch Circuit Common Transistor Sharing
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Solution Overview
Problem
Conventional RF antenna switch circuits face challenges in miniaturization and high output power transmission due to the need for multiple transistors on transmitting and receiving paths, leading to increased size and reduced isolation characteristics.
Innovation Solution
An RF antenna switch circuit design that includes a common switch block shared between transmitting and receiving paths, with a drain-source serial connection structure of field effect transistors, and shunt switch blocks connected in parallel to improve isolation and reduce size by synchronizing switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple transistors are connected in series on transmitting and receiving paths to withstand high output power, then the power handling capability is improved, but the size of the RF switch is increased
Solution Approach 1:
The patent merges the transmitting path and receiving path by sharing the common node and using a single common transistor instead of separate transistors for each path. This consolidation reduces the total number of transistors from four (two series transistors per path) to three (one series transistor per path plus one shared common transistor), thereby reducing the RF switch size while maintaining high output power handling capability through the series connection structure.
Solution Approach 2:
The common transistor serves multiple functions by being shared between both the transmitting path and receiving path. It acts as part of the series connection for power handling in transmission mode and similarly in reception mode, eliminating the need for separate transistors for each path and reducing overall device complexity and size.
2Reliability
If transmitting terminal-side shunt transistor and receiving terminal-side shunt transistor are provided with multiple transistors stacked in series to withstand high output power, then the isolation characteristic is improved, but the size of the RF switch is increased
Solution Approach 1:
The patent merges the shunt transistor configurations by stacking transistors in series within each shunt path (transmitting terminal-side and receiving terminal-side) rather than using parallel connections. This series stacking achieves the required isolation characteristic and power handling capability while minimizing the number of transistors needed, thereby reducing the overall RF switch size.
Data Source
AI summary
The present invention relates to an RF antenna switch circuit, a high frequency antenna component, and a mobile communication device. According to the present invention, an RF antenna switch circuit including: an antenna; an input/output terminal including at least one transmitting terminal and at least one receiving terminal; at least one transmitting switch block disposed on a transmitting path(s) between the at least one transmitting terminal and a common node; at least one receiving switch block disposed on a receiving path(s) between the at least one receiving terminal and the common node; and a common switch block sharing a switching device and turned on by synchronizing with each of transmitting and receiving operations on transceiving the signal through the antenna is provided. When one of the transmitting and receiving operations is turned on, the other is turned off.