A 300 GHz CMOS Transmitter with 32-QAM 17.5 Gb/s/ch Capability over Six Channels

Kosuke Katayama; Kyoya Takano; Shuhei Amakawa; Shinsuke Hara; Akifumi Kasamatsu; Koichi Mizuno; Kazuaki Takahashi; Takeshi Yoshida; Minoru Fujishima

doi:10.1109/JSSC.2016.2602223

A 300 GHz CMOS Transmitter with 32-QAM 17.5 Gb/s/ch Capability over Six Channels

Kosuke Katayama, Kyoya Takano, Shuhei Amakawa, Shinsuke Hara, Akifumi Kasamatsu, Koichi Mizuno, Kazuaki Takahashi, Takeshi Yoshida, Minoru Fujishima

Research output: Contribution to journal › Article › peer-review

93 Citations (Scopus)

Abstract

A 300 GHz transmitter (TX) fabricated using a 40 nm CMOS process is presented. It achieves 17.5 Gb/s/ch 32-quadrature amplitude modulation (QAM) transmission over six 5 GHz-wide channels covering the frequency range from 275 to 305 GHz. With the unity-power-gain frequency f_max of the NMOS transistor being below 300 GHz, the TX adopts a power amplifier-less QAM-capable architecture employing a highly linear subharmonic mixer called a cubic mixer. It is based on and as compact as a tripler and enables the massive power combining necessary above f_max without undue layout complication. The frequency-dependent characteristics of the cubic mixer are studied, and it is shown that even higher data rates of up to 30 Gb/s are possible at certain frequencies, where the channel signal-to-noise ratio is high. The design and the operation of the power-splitting and power-combining circuits are also described in detail. The measurements reported herein were all made 'wired' via a WR3.4 waveguide.

Original language	English
Article number	7565498
Pages (from-to)	3037-3048
Number of pages	12
Journal	IEEE Journal of Solid-State Circuits
Volume	51
Issue number	12
DOIs	https://doi.org/10.1109/JSSC.2016.2602223
Publication status	Published - 2016 Dec
Externally published	Yes

Keywords

Power combiner
power splitter
quadrature amplitude modulation (QAM)
subharmonic mixing
terahertz (THz) transmitter (TX)

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/JSSC.2016.2602223

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title = "A 300 GHz CMOS Transmitter with 32-QAM 17.5 Gb/s/ch Capability over Six Channels",

abstract = "A 300 GHz transmitter (TX) fabricated using a 40 nm CMOS process is presented. It achieves 17.5 Gb/s/ch 32-quadrature amplitude modulation (QAM) transmission over six 5 GHz-wide channels covering the frequency range from 275 to 305 GHz. With the unity-power-gain frequency fmax of the NMOS transistor being below 300 GHz, the TX adopts a power amplifier-less QAM-capable architecture employing a highly linear subharmonic mixer called a cubic mixer. It is based on and as compact as a tripler and enables the massive power combining necessary above fmax without undue layout complication. The frequency-dependent characteristics of the cubic mixer are studied, and it is shown that even higher data rates of up to 30 Gb/s are possible at certain frequencies, where the channel signal-to-noise ratio is high. The design and the operation of the power-splitting and power-combining circuits are also described in detail. The measurements reported herein were all made 'wired' via a WR3.4 waveguide.",

keywords = "Power combiner, power splitter, quadrature amplitude modulation (QAM), subharmonic mixing, terahertz (THz) transmitter (TX)",

author = "Kosuke Katayama and Kyoya Takano and Shuhei Amakawa and Shinsuke Hara and Akifumi Kasamatsu and Koichi Mizuno and Kazuaki Takahashi and Takeshi Yoshida and Minoru Fujishima",

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year = "2016",

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doi = "10.1109/JSSC.2016.2602223",

language = "English",

volume = "51",

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T1 - A 300 GHz CMOS Transmitter with 32-QAM 17.5 Gb/s/ch Capability over Six Channels

AU - Katayama, Kosuke

AU - Takano, Kyoya

AU - Amakawa, Shuhei

AU - Hara, Shinsuke

AU - Kasamatsu, Akifumi

AU - Mizuno, Koichi

AU - Takahashi, Kazuaki

AU - Yoshida, Takeshi

AU - Fujishima, Minoru

PY - 2016/12

Y1 - 2016/12

N2 - A 300 GHz transmitter (TX) fabricated using a 40 nm CMOS process is presented. It achieves 17.5 Gb/s/ch 32-quadrature amplitude modulation (QAM) transmission over six 5 GHz-wide channels covering the frequency range from 275 to 305 GHz. With the unity-power-gain frequency fmax of the NMOS transistor being below 300 GHz, the TX adopts a power amplifier-less QAM-capable architecture employing a highly linear subharmonic mixer called a cubic mixer. It is based on and as compact as a tripler and enables the massive power combining necessary above fmax without undue layout complication. The frequency-dependent characteristics of the cubic mixer are studied, and it is shown that even higher data rates of up to 30 Gb/s are possible at certain frequencies, where the channel signal-to-noise ratio is high. The design and the operation of the power-splitting and power-combining circuits are also described in detail. The measurements reported herein were all made 'wired' via a WR3.4 waveguide.

AB - A 300 GHz transmitter (TX) fabricated using a 40 nm CMOS process is presented. It achieves 17.5 Gb/s/ch 32-quadrature amplitude modulation (QAM) transmission over six 5 GHz-wide channels covering the frequency range from 275 to 305 GHz. With the unity-power-gain frequency fmax of the NMOS transistor being below 300 GHz, the TX adopts a power amplifier-less QAM-capable architecture employing a highly linear subharmonic mixer called a cubic mixer. It is based on and as compact as a tripler and enables the massive power combining necessary above fmax without undue layout complication. The frequency-dependent characteristics of the cubic mixer are studied, and it is shown that even higher data rates of up to 30 Gb/s are possible at certain frequencies, where the channel signal-to-noise ratio is high. The design and the operation of the power-splitting and power-combining circuits are also described in detail. The measurements reported herein were all made 'wired' via a WR3.4 waveguide.

KW - Power combiner

KW - power splitter

KW - quadrature amplitude modulation (QAM)

KW - subharmonic mixing

KW - terahertz (THz) transmitter (TX)

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A 300 GHz CMOS Transmitter with 32-QAM 17.5 Gb/s/ch Capability over Six Channels

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Keywords

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