A 62–85-GHz High Linearity Upconversion Mixer With 18-GHz IF Bandwidth

This letter presents a 62–85-GHz high linearity upconversion mixer, which is fabricated in a standard 65-nm CMOS process. The proposed upconversion mixer adopts a transconductance stage which consists of a common-source path and a cross-coupled common-gate path to enhance the linearity. In addition, the transconductance stage can also be beneficial to realize a wide IF impedance matching. To achieve a compact layout, a transformer is used to serve as an inductive load stage, a balun, and output matching network. The measured input 1-dB compression point (IP _{1 dB} ) is 2.14 dBm at 77 GHz. The measured maximum conversion gain is −4.3 dB with a 3-dB RF bandwidth from 62 to 85 GHz. Furthermore, the proposed mixer also exhibits a wide 3-dB IF bandwidth of 18 GHz, which can sustain a high data-rate transmission.