講演情報
[14p-P10-17]Comparative Analysis of High-Speed Time-Interleaved Digital-to-Analog Converters
〇(M2)Yunjie Chen1, Koji Asami2, Zolboo Byambadorj1, Akio Higo1, Tetsuya Iizuka1 (1.The Univ. of Tokyo, 2.Advantest Corp.)
キーワード：
digital to analog converter、Time interleave
Over the last decades, the annual global Internet Protocol (IP) traffic has surged dramatically and is expected to continue growing. By 2023, the number of devices connected to IP networks is projected to exceed three times the global population. The number of networked devices has a 50% increase from 2018 to 2023. The network speed is expected to more than triple by 2023. By that time, 5G connection speeds will be approximately 13 times faster than the average mobile connection, reaching 575 Mbps on average [1]. One of the most critical blocks in the communication system is the digital-to-analog converter (DAC), which is a circuit that converts digital signals to analog signals. Recent high-speed DAC designs often utilize the interleaving technique, particularly time-interleaving (TI), to extend the bandwidth and overall sampling rate without increasing the sampling rate of a single-channel DAC (sDAC). However, since the development speed of communication systems has become faster and faster, 2-channel interleaving DACs can hardly meet the higher sampling rate and bandwidth demands, such as beyond 5G and 6G. Although massive time interleaving is widely applied to analog-to-digital converters (ADCs), only limited publications discuss TI architectures with four or more channels in current-steering DACs [2][3]. In this poster, we proposed a hybrid segment architecture of 4-channel TI-DAC, as Fig. 1 shows. This structure incorporates a pre-filter, a single-stage analog multiplexer, and an output combiner, enabling improved performance and compromising bandwidth and usable output swing. The simulation result highlights the effectiveness of the hybrid architecture in achieving superior SNR with sufficient bandwidth and overcoming the challenges of channel number extension when compared to other 4-channel architectures.