A 70–89.8-GHz LNA With Transformer-Based T-Shape Matching and Pole-Tuning Techniques

Abstract

This letter presents a broadband E-band low-noise amplifier (LNA) for radar and communication applications. A three-stage cascade structure is adopted with pole-tuning technique to extend the bandwidth. Two transformer-based T-shape matching networks are proposed for input and output impedance matching, which has the advantage of compactness and wideband matching. The proposed LNA was fabricated in a 40-nm LP CMOS process with a core area of 0.067 mm2. Under a power consumption of 18 mW, the LNA achieves a peak gain of 11.9 dB at 84.5 GHz, a 3-dB bandwidth of 20 GHz, a minimum noise figure (NF) of 5.96 dB, and a IP $_{\text {1 dB}}$ of −11.7 dBm with in-band variation of less than 1.2 dB.