Browsing by Author "Itoh, Tatsuo"

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A 20Gb/s 79.5mW 127GHz CMOS Transceiver with Digitally Pre-Distorted PAM-4 Modulation for Contactless Communications
(2018-01-01)
Kim, Yanghyo
;
Hu, Boyu
;
Du, Yuan
;
Tang, Adrian
;
Chen, Huan-Neng
A 20Gb/s 79.5mW 127GHz CMOS Transceiver with Digitally Pre-Distorted PAM-4 Modulation for Contactless Communications
(2018-01-01)
Kim, Yanghyo
;
Hu, Boyu
;
Du, Yuan
;
Tang, Adrian
;
Chen, Huan-Neng
A Millimeter-Wave CMOS Transceiver With Digitally Pre-Distorted PAM-4 Modulation for Contactless Communications
(2019-06-01)
Kim, Yanghyo
;
Hu, Boyu
;
Du, Yuan
;
Cho, Wei-Han
;
Huang, Rulin
This paper presents a millimeter-wave (127 GHz) CMOS transceiver with a digital pre-distortion capable PAM-4 modulator for contactless communications. The transmitter upconverts PAM-4 modulated baseband signals through a free-running 127-GHz oscillator and single-balanced mixer, and it delivers PAM-4 modulated carrier signals to a folded-dipole antenna, which is designed on a FR408HR substrate. The receiver's low-noise amplifier provides a 10-dB gain, and the self-mixer downconverts carrier-modulated PAM-4 signals to base-band signals without the necessity of carrier synchronization. The PAM-4 modulator pre-distorts the baseband signals and corrects the non-linear characteristics of the transmitter's upconversion mixer and the receiver's downconversion self-mixer. Designed and fabricated in a 65-nm CMOS process, the demonstrated system transfers 20 Gb/s of PAM-4 modulated data through a 1-mm air gap and consumes 79.5 mW (transmitter: 50.8 mW and receiver: 28.7 mW) of power under a 1.2-V supply, achieving a 3.98-pJ/bit energy efficiency. The communication distance is extended to 3 cm by inserting a dielectric waveguide between the same transceiver.
A Novel Fully Synthesizable All-Digital RF Transmitter for IoT Applications
(2018-01-01)
Li, Yilei
;
Dhwaj, Kirti
;
Wong, Chien-Heng
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Du, Yuan
;
Du, Li
In this paper, a fully synthesizable all-digital transmitter (ADTX) is first proposed. This transmitter (TX) uses Cartesian architecture and supports wide-band quadratic-amplitude modulation with wide carrier frequency range. Furthermore, the design methodology for ADTX and corresponding bandpass filter is discussed. This TX is synthesized with digital register transfer level-graphic database system flow, and can be easily implemented in any standard CMOS technology. An exemplary TX is synthesized by TSMC 28-nm standard cell library with extremely small area (0.0009 mm(2)) and supports carrier frequency as high as 6 GHz with excellent error vector magnitude (<-30 dB). To the best of the authors' knowledge, this is the first work on a fully synthesizable design of RF transistors, allowing easy technology migration and portability.
Impulse response analysis of carrier-modulated multiband RF-interconnect (MRFI)
(2017-12-01)
Kim, Yanghyo
;
Cho, Wei-Han
;
Du, Yuan
;
Cong, Jason
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Itoh, Tatsuo