Youming Zhang, Zhennan Wei, Xusheng Tang, Linghan Zhang, F. Huang
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A 76.5–92.6 GHz CMOS LNA Using Two-Port kQ-Product Theory for Transformer Design
This letter presents a convenient approach based on the two-port $kQ$ -product theory to analyze the influence of interwinding capacitive coupling on the efficiency of the transformer. It is demonstrated that a transformer with proper size can benefit from the interwinding capacitive coupling to maximize its efficiency at a desired frequency. The proposed design approach is used in a $W$ -band low-noise amplifier (LNA) fabricated with the 40-nm CMOS process to optimize the insertion loss of the input transformer-based balun. Thanks to the approach, the $W$ -band LNA achieves a minimum noise figure of 5.7 dB, a maximum gain of 18.5 dB, and a 3-dB bandwidth of 76.5–92.6 GHz, while consuming 23.4 mW from a 0.9-V supply.
期刊介绍：
The IEEE Microwave and Wireless Components Letters (MWCL) publishes four-page papers (3 pages of text + up to 1 page of references) that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, medical and industrial activities. Microwave theory and techniques relates to electromagnetic waves in the frequency range of a few MHz and a THz; other spectral regions and wave types are included within the scope of the MWCL whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.
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