On the Design of Wideband Transformer-Based Fourth Order Matching Networks for ${E}$ -Band Receivers in 28-nm CMOS

Abstract

This paper discusses the design of on-chip transformer-based fourth order filters, suitable for mm-Wave highly sensitive broadband low-noise amplifiers (LNAs) and receivers (RXs) implemented in deep-scaled CMOS. Second order effects due to layout parasitics are analyzed and new design techniques are introduced to further enhance the gain-bandwidth product of this class of filters. The design and measurements of a broadband 28-nm bulk CMOS LNA and a sliding-IF RX tailored for ${E}$ -band (i.e., 71–76-GHz and 81–86-GHz) point-to-point communication links are presented. Leveraging the proposed design methodologies, the ${E}$ -band LNA achieves a figure of merit $\approx 10.5$ -dB better than state-of-the-art designs in the same band and comparable to LNAs at lower frequencies. The RX achieves 30.8-dB conversion gain with ${E}$ -band with wide margin.