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Design of High-linearity Delay Detection Circuit for 10-Gb/s Communication System in 65-nm CMOS
Kosuke Furuichi,Hiromu Uemura,Natsuyuki Koda,Hiromi Inaba,Keiji Kishine 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.6
This paper describes a method of designing a circuit to detect high-linearity delay at 10 Gb/s. We proposed a transmission system for additional data in previous work, by using a frequency modulation technique. The demodulation characteristics in the receiver strongly depended on data speed. As the data speed gets higher, demodulation characteristics linearity degradation become larger. In this paper, we propose a circuit to provide high-linearity demodulation characteristics by using an emphasis technique which reduces degradation in the demodulated signal. We fabricated the circuit to detect delay with an emphasis technique by using 65- nm CMOS process. The results we obtained from measurements, revealed an integrated circuit (IC) achieved 10% higher linearity than a receiver without emphasis at 10 Gb/s.
Natsuyuki Koda,Furuichi Kosuke,Hiromu Uemura,Hiromi Inaba,Keiji Kishine 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.6
This paper proposes a simple and low power highly sensitive frequency demodulator. In the previous work, we proposed a multiplex communication system that transmits additional data by using a frequency modulation technique and the proposed circuit provided highly sensitive characteristics on frequency demodulation. However, with this configuration, there is the problem that the power consumption and the number of control points increase. Therefore, in this paper, we propose a simple and lower power circuit configuration. We investigated the characteristics of these frequency demodulators using a prototype demodulation system consisting of an FPGA and discrete devices. Compared with the delay detection circuit, the proposed simple and lower power demodulation system, which showed the same output characteristics as the conventional sensitive demodulator, successfully detected about twice the detection data than the delay detection circuit did.
( Kazuei Ishii ),( Tohru Furuichi ),( Noboru Tanikawa ),( Takanori Honma ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
In Japan, community and controllable closed system disposal facilities (CSDFs) have been proposed and constructed. In CSDFs, waste stabilization can be promoted by methods such as the sprinkling of water (i.e. artificial rainfall). In this study, a washout model was proposed to investigate the amount,rate and frequency of water sprinkling onto bottom ash layers in CSDFs. In this model, mass transfer between solid and immobile water phases was considered. Some column experiments were carried out, initially to investigate the characteristics of elution of total organic carbon (TOC), and later to determine parameters in the model and to evaluate the effectiveness of the model. The consistency of calculated values with observed values showed that this washout model is valid for this experimental period. It is suggested, based on this study, that it might be desirable to keep the water content of the bottom ash layers constant, in order to wash out TOC constituents effectively.