研究目的
Investigating the design and performance of a vertically symmetric lumped element directional coupler (VSLEDC) for broadband characteristics in radio frequency systems.
研究成果
The proposed VSLEDC demonstrated a significant improvement in bandwidth (43.8% broader) compared to HVSLEDC under similar design conditions, with compact size and acceptable insertion loss. This design approach offers a promising solution for broadband applications in radio frequency systems.
研究不足
The study focuses on a specific design and implementation in a 130 nm CMOS technology, which may limit its applicability to other technologies or frequencies without further optimization.
1：Experimental Design and Method Selection:
The study proposed a VSLEDC design to enhance bandwidth compared to traditional HVSLEDCs. The design utilized lumped elements (inductors and capacitors) for size reduction and employed even and odd mode analyses for circuit analysis.
2：Sample Selection and Data Sources:
The coupler was implemented in a Global Foundry 130 nm CMOS technology, with specific component values chosen for CT, CB, and CC.
3：List of Experimental Equipment and Materials:
The implementation used an octagonal interleaved structure with a 3 μm thick top metal layer for the transformer design, with specified width and spacing.
4：Experimental Procedures and Operational Workflow:
The coupler's performance was evaluated using S-parameters (S11, S21, S31, S41) to assess input matching, transmission gain, coupling, isolation, and directivity.
5：Data Analysis Methods:
The study derived design conditions to maximize isolation and used simulation and measurement results to compare the performance of VSLEDC and HVSLEDC.
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