An 80-Gb/s 300-GHz-Band Single-Chip CMOS Transceiver

• Published in: IEEE journal of solid-state circuits Vol. 54; no. 12; pp. 3577 - 3588
• Main Authors: Lee, Sangyeop, Hara, Shinsuke, Yoshida, Takeshi, Amakawa, Shuhei, Dong, Ruibing, Kasamatsu, Akifumi, Sato, Junji, Fujishima, Minoru
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Architecture; Beyond 5G; Circuits; CMOS; Frequency doublers; Frequency modulation; IEEE 802.15 Standard; Layout; Mixers; MOSFETs; near-<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">f ₘₐₓ circuits; Noise levels; Power consumption; Quadrature amplitude modulation; Single sideband transmission; terahertz wireless communication; Transceivers; Transmission lines; Upconversion; Wireless communication
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2019.2944855

A single-chip CMOS transceiver (TRX) capable of wireless data rates up to 80 Gb/s using part of frequencies (252-279 GHz) covered by IEEE Std 802.15.3d is presented. The TRX chip operates in either transmitter (TX) or receiver (RX) mode at frequencies comparable to f max of the NMOSFET. The TX part adopts mixer-last architecture with four-way power combining using a ring circuit called a double-rat-race. The RX part adopts fundamental-mixer-first direct-conversion architecture. In the RX mode, the TX serves as an LO multiplier chain, which conventionally accounted for a significant part of the RX die area. The double-rat-race, having an improved design than the original one, integrates the TX and RX and also rejects unwanted harmonics generated by the frequency-doubler-based upconversion mixer. Low-loss, low-characteristic-impedance transmission lines are used extensively to combat losses. The TRX was fabricated using a 40-nm CMOS process. The saturated output power of the TX is -1.6 dBm at 265.68 GHz. The mean single-sideband noise figure (SSB NF) of the RX is 22.9 dB. The TX mode and the RX mode consume dc power of 890 and 897 mW, respectively. A wireless data rate of 80 Gb/s between a pair of TRX chips is demonstrated with 16QAM over a distance of 3 cm.