TY - GEN
T1 - A 300-GHz 64-QAM CMOS transmitter with 21-Gb/s maximum per-channel data rate
AU - Takano, Kyoya
AU - Katayama, Kosuke
AU - Amakawa, Shuhei
AU - Yoshida, Takeshi
AU - Fujishima, Minoru
N1 - Publisher Copyright:
© 2016 European Microwave Association.
PY - 2016/12/7
Y1 - 2016/12/7
N2 - A 300-GHz CMOS transmitter that covers the vast unallocated frequency band above 275 GHz with six channels has recently been reported. It employed a tripler-based subharmonic mixer called the cubic mixer. However, the maximum perchannel data rate was limited to 17.5 Gb/s with 32 QAM because of the interference between the desired signal and the unwanted image signals at approximately 300 GHz, originating from an image of the second intermediate frequency signal, IF2, at around 100 GHz. In this study, we show that the image signals at around 300 GHz can be reduced significantly by using a set of LO frequencies different from that used previously, without impacting the allocation of the six channels. This is accomplished because the image of IF2 is driven out-of-band of the IF amplifier for IF2. As a result, the maximum per-channel data rate reached 21 Gb/s with 64 QAM. The aggregate data rate over six channels is 123 Gb/s.
AB - A 300-GHz CMOS transmitter that covers the vast unallocated frequency band above 275 GHz with six channels has recently been reported. It employed a tripler-based subharmonic mixer called the cubic mixer. However, the maximum perchannel data rate was limited to 17.5 Gb/s with 32 QAM because of the interference between the desired signal and the unwanted image signals at approximately 300 GHz, originating from an image of the second intermediate frequency signal, IF2, at around 100 GHz. In this study, we show that the image signals at around 300 GHz can be reduced significantly by using a set of LO frequencies different from that used previously, without impacting the allocation of the six channels. This is accomplished because the image of IF2 is driven out-of-band of the IF amplifier for IF2. As a result, the maximum per-channel data rate reached 21 Gb/s with 64 QAM. The aggregate data rate over six channels is 123 Gb/s.
KW - CMOS transmitter
KW - QAM
KW - THz
KW - cubic mixer
KW - image reduction
UR - http://www.scopus.com/inward/record.url?scp=85010430827&partnerID=8YFLogxK
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U2 - 10.1109/EuMIC.2016.7777523
DO - 10.1109/EuMIC.2016.7777523
M3 - Conference contribution
AN - SCOPUS:85010430827
T3 - EuMIC 2016 - 11th European Microwave Integrated Circuits Conference
SP - 193
EP - 196
BT - EuMIC 2016 - 11th European Microwave Integrated Circuits Conference
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th European Microwave Integrated Circuits Conference, EuMIC 2016
Y2 - 3 October 2016 through 4 October 2016
ER -