A Wideband On-Chip Directional Coupler Using a Negative Capacitance Circuit

Doan, Nhut-Tan; Lai, Ngoc‐Duy‐Hien; Kim, Hyoungsoo; Yoon, Sang Wook

doi:10.1109/tmtt.2018.2876259

Cited by 4 publications

(1 citation statement)

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“…The early uses of transistors to design an active directional coupler are proposed in Pellegrini, 4 Denoth and Pellegrini, 5 and Stuckert 6 . Complementary metal oxide semiconductor (CMOS) directional couplers with good linearity, low noise figure, and small coupling variations are reported in Doan et al 7 Furthermore, because of its on‐chip design, the CMOS directional couplers require minimal external connections useful in the portable applications such as, in portable network analyzers, wireless communication applications, RF built‐in‐self‐test (BiST) applications and so on 8‐10 . However, the above couplers are higher in cost because of their circuit complexity and higher power requirements (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Broadband CMOS unidirectional coupler using differential mode suppression

Tirmanwar,

Ghosh

2024

Micro & Optical Tech Letters

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This paper describes the design of a broadband, unidirectional coupler designed using complementary metal oxide semiconductor technology. The proposed coupler achieves high isolation by using a differential mode suppressor, employing a differential splitter, followed by a common mode combiner. An intermediary network is used to match all stages to the ports. The coupler, fabricated using United Microelectronics Corporation 180 nm RF/MM technology, achieves better than 15 dB isolation from 0.2 to 1.5 GHz. For this band, it achieves a near flat coupling of 5 dB. The net coupler area is mm2. Such broadband unidirectional couplers can be used in network analyzer testsets.

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