A 21-41 GHz Compact Wideband Low-Noise Amplifier Based on Transformer-Feedback Technique in 65-nm CMOS

A compact wideband low-noise amplifier (LNA) with utilizing the transformer-feedback technique for 5G multi-band millimeter-wave application is proposed. The proposed LNA composes of cascaded common source stage and cascode stage based on the shunt-series input transformer, positive drain-source inter-stage transformer and negative drain-source feedback output transformer to realize wider input matching bandwidth, higher gain and stability respectively. The LNA shows that the 3-dB bandwidth is from 21 to 41 GHz, which covers the whole Ka band, the maximum power gain is 14.2 dB, and the NF from 3.0 to 4.6 dB. The dc power consumption is 17.5 mW with 1-V supply voltage. Taking advantage of the exceeding compactness from more the transformer-based techniques, the LNA occupies compact chip area of 0.18 mm
²
with pads using 65-nm CMOS process.