A 50–67-GHz Transformer-Based Six-Port Balanced-to-Unbalanced Quadrature Hybrid Coupler
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Abstract:
This letter presents the first on-chip transformer-based six-port balanced-to-unbalanced quadrature hybrid coupler (QHBC). The proposed six-port QHBC employs three transformers to replace eight inductors design in conventional LC-based couplers for miniaturization. Fabricated in CMOS 28 nm, the overall size of the proposed coupler is 0.23 mm $\times0.17$ mm, which is equivalent to $0.046\…