A 120 GHz Wideband CMOS I/Q Transmitter for Short-Range Wireless Device-to-Device Communication

Abstract

In this paper, we present a 120 GHz CMOS I/Q transmitter for short-range wireless device-to-device communication. Targeting 16-QAM communication at a transmission distance of 10 cm, an I/Q transmitter with an injection-locked frequency tripler chain (ILFT) having a data transfer rate oftens of Gbps is designed. To minimize the image-rejection ratio (IMRR) and enhance the EVM performance, the I/Q gain and phase calibration circuits are also integrated in the ILFT. In the simulation, our proposed transmitter exhibits wideband characteristics over 25 GHz and 14.7 dB conversion gain. From the I/Q calibration, the transmitter shows a high IMRR over 50 dBc.