Browsing by Author "Tsai, Ching-Han"

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A 77-GHz 2T6R Transceiver With Injection-Lock Frequency Sextupler Using 65-nm CMOS for Automotive Radar System Application
(2016-10)
Hsiao, Yuan-Hung
;
Chang, Yu-Chuan
;
Tsai, Ching-Han
;
Huang, Ting-Yi
;
Aloui, Sofiane
In this paper, a CMOS multichannel transceiver (TRX) is proposed for angular identification in automotive car radar applications. Two transmitters (TXs) and six receivers (RXs) are placed on the same die using 65-nm CMOS technology with chip size 3.5x3 mm(2). To generate a millimeter-wave (MMW) frequency-modulated continuous-wave signal, an injection-lock frequency sextupler cascaded a 1-to-8 Wilkinson power dividing network with wideband isolation is designed as the LO-chain to convert external source from 12.5-13.7 to 75-82.2 GHz for both the TXs and RXs. Each TX achieves above 11-dBm output power and the RXs achieve 30-dB conversion gain from 75 to 82 GHz, and the total power dissipation of whole chip is 1.43 W. Compared with other published multichannel TRXs in silicon germanium (SiGe) process, this paper demonstrates compatible performances and the potential of multichannel TRX using CMOS for MMW automotive car radar application.
A Co-design of Dielectric Lens and Folded Reflectarray Antenna with the Application to 77 GHz Long-Range Mode Forward-Looking Vehicle Collision Warning Radar System
(2012)
Tsai, Ching-Han
;
Kan, Li-Han
;
Chen, Huo-Hui
;
Chung, Shyh-Jong
;
傳播研究所
A novel antenna for the application of the long-range mode forward-looking collision warning radar system was developed and demonstrated in this paper. By the co-design of the folded-reflectarray antenna and the dielectric lens, a long-range mode operation can be realized. When the radar system is operated in the long range mode, the antenna had high directivity characteristic. To cooperate with the algorithm used in long range mode (76 - 77 GHz). The antenna we introduce in this paper has the advantages to integrate the two different modes in one structure, miniaturize the total size and further comprise the IC in the same structure.