Wideband 120-GHz CMOS I/Q Transmitter With Suppressed IMRR and LOFT for Wireless Short-Range High-Speed 6G IoT Applications
- Authors
- Kim, Seung Hun; Jang, Tae Hwan; Kang, Dong Min; Jung, Kyung Pil; Park, Chul Soon
- Issue Date
- Jul-2023
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Gain; Mixers; Transmitters; Wireless communication; Internet of Things; Radio frequency; Wideband; 120-GHz; 16-QAM; 6G; complementary metal oxide semiconductor (CMOS); D-band; distortion; Internet of Things (IoT); SNDR; transmitter; wideband
- Citation
- IEEE Internet of Things Journal, v.10, no.13, pp.11739 - 11748
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE Internet of Things Journal
- Volume
- 10
- Number
- 13
- Start Page
- 11739
- End Page
- 11748
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/113854
- DOI
- 10.1109/JIOT.2023.3243129
- ISSN
- 2327-4662
- Abstract
- In this study, a wideband 120-GHz I/Q transmitter with suppressed image rejection ratio (IMRR) and LO feed through (LOFT) is presented using 40-nm complementary metal oxide semiconductor technology. For the up-conversion mixer, an NMOS/PMOS pair with resistive feedback is used during the transconductance stage to increase the input bandwidth with gain boosting, and a novel switching core without LO-RF coupling is used to suppress the LOFT effect. For the quadrature injection locked tripler, an I/Q calibration circuit is inserted to minimize the I/Q mismatch; accordingly, the measured IMRR is greatly improved. The peak conversion gain of the proposed transmitter was 10.8 dB, and the 3-dB gain bandwidth was 20 GHz. The measured IMD2 and IMD3 were above 40 dBc. Moreover, the IMRR was measured as 43.1 dBc, applying I/Q calibration. The measured LOFT was 33.7 dBc. The data rate of the proposed transmitter was measured up to 20 Gbps and at a distance of 5 cm. Subsequently, the error vector magnitudes were 13.4 dB for QPSK and -19.1 dB for 16-QAM modulation. It is expected that such wireless high-speed communication can be applied to wireless short-range high-speed 6G IoT applications.
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