20.1 A 300GHz 40nm CMOS transmitter with 32-QAM 17.5Gb/s/ch capability over 6 channels
20.1 A 300GHz 40nm CMOS transmitter with 32-QAM 17.5Gb/s/ch capability over 6 channels
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20.1 300GHz 40nm CMOS 发射器，在 6 个通道上具有 32-QAM 17.5Gb/s/ch 功能
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Fujishima
中科院分区：
文献类型：
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作者：
K. Katayama;K. Takano;S. Amakawa;S. Hara;A. Kasamatsu;K. Mizuno;Kazuaki Takahashi;T. Yoshida;M. Fujishima
275 GHz以上的巨大未分配频带为超高速无线通信提供了巨大的潜力。可以分配用于多信道通信的总带宽可以容易地是9 GHz的60 GHz未授权带宽的几倍。我们提出了一个300 GHz的发射机（TX）在40纳米CMOS，能够32正交幅度调制（QAM）17.5Gb/s/ch的信号传输。如图20.1.1顶部所示，它可以覆盖275至305 GHz的频率范围，具有6个通道。图20.1.1还根据最近报告的200 GHz以上TX列出了可能的THz TX架构。架构的选择在很大程度上取决于晶体管单位功率增益频率fmax。如果fmax比载波频率高得多，那么普通功率放大器（PA）-last架构（图20.1.1，表的顶行）是可能的，并且是优选的[1-3]，尽管PA的存在当然不是必需的[4，5]。另一方面，如果fmax与载波频率相当或低于载波频率，则必须采用无PA架构。典型的这种结构是最后倍频结构（图20.1.1，表的中间行）。例如，报告了260 GHz四倍器最后开关键控（OOK）TX [6]和434 GHz三倍器最后幅移键控（ASK）TX [7]。这种架构的缺点是由于信号带宽扩展而导致的带宽利用效率低下。另一个缺点是，使用多位数字调制是非常困难的，如果不是不可能的话。一个例外是正交相移键控（QPSK）和三倍频的组合。当QPSK调制的中频（IF）信号经历频率三倍时，所得到的信号星座图保持具有某种符号排列的QPSK的星座图。这样的三重最后240 GHz QPSK TX被报道[8]。然而，例如，16-QAM星座将因频率三倍而遭受严重失真。如果要认真考虑将300 GHz频段作为超高速无线通信平台，QAM能力将是必不可少的。
The vast unallocated frequency band lying above 275GHz offers enormous potential for ultrahigh-speed wireless communication. An overall bandwidth that could be allocated for multi-channel communication can easily be several times the 60GHz unlicensed bandwidth of 9GHz. We present a 300GHz transmitter (TX) in 40nm CMOS, capable of 32-quadrature amplitude modulation (QAM) 17.5Gb/s/ch signal transmission. It can cover the frequency range from 275 to 305GHz with 6 channels as shown at the top of Fig. 20.1.1. Figure 20.1.1 also lists possible THz TX architectures, based on recently reported above-200GHz TXs. The choice of architecture depends very much on the transistor unity-power-gain frequency fmax. If the fmax is sufficiently higher than the carrier frequency, the ordinary power amplifier (PA)-last architecture (Fig. 20.1.1, top row of the table) is possible and preferable [1-3], although the presence of a PA is, of course, not a requirement [4,5]. If, on the other hand, the fmax is comparable to or lower than the carrier frequency as in our case, a PA-less architecture must be adopted. A typical such architecture is the frequency multiplier-last architecture (Fig. 20.1.1, middle row of the table). For example, a 260GHz quadrupler-last on-off keying (OOK) TX [6] and a 434GHz tripler-last amplitude-shift keying (ASK) TX [7] were reported. A drawback of this architecture is the inefficient bandwidth utilization due to signal bandwidth spreading. Another drawback is that the use of multibit digital modulation is very difficult, if not impossible. An exception to this is the combination of quadrature phase-shift keying (QPSK) and frequency tripling. When a QPSK-modulated intermediate frequency (IF) signal undergoes frequency tripling, the resulting signal constellation remains that of QPSK with some symbol permutation. Such a tripler-last 240GHz QPSK TX was reported [8]. However, a 16-QAM constellation, for example, would suffer severe distortion by frequency tripling. If the 300GHz band is to be seriously considered for a platform for ultrahigh-speed wireless communication, QAM-capability will be a requisite.
DOI：
10.1109/irmmw-thz.2014.6956202
发表时间：
2014-11
期刊：
2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)
影响因子：
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作者：
F. Boes;T. Messinger;J. Antes;D. Meier;A. Tessmann;A. Inam;I. Kallfass
通讯作者：
F. Boes;T. Messinger;J. Antes;D. Meier;A. Tessmann;A. Inam;I. Kallfass