https://scholar.dgist.ac.kr/handle/20.500.11750/46315 2026-09-10T22:38:46Z https://scholar.dgist.ac.kr/handle/20.500.11750/60710 Title: 저전력 고선형 저잡음 증폭기 Author(s): 송민영; 박찬수 https://scholar.dgist.ac.kr/handle/20.500.11750/59196 Title: CONTINUOUS TIME DELTA SIGMA ANALOG-DIGITAL CONVERSION DEVICE CAPABLE OF SIMULTANEOUSLY MEASURING VOLTAGE AND CURRENT Author(s): 윤종혁; 송민영; 이정협; 설태령 Abstract: Disclosed is an analog-digital converter capable of simultaneously obtaining a voltage and a current. The disclosed analog-digital converter can simultaneously obtain a voltage and a current by using a hybrid integrator for simultaneously receiving and integrating the voltage and the current and a quantizer for generating a differential mode output and a common mode output through comparison with a reference voltage. By using the analog-digital converter according to an exemplary embodiment, the size of a system can be maintained small while consuming less power, and thus a biometric response can be easily identified and analyzed. https://scholar.dgist.ac.kr/handle/20.500.11750/58567 Title: Design and Analysis of ΔΣ Modulator Analogous Bang-Bang Digital PLL Author(s): Park, Minsu; Yoon, Jong-Hyeok; Song, Minyoung Abstract: This paper presents the analysis and design methodology of a second-order ΔΣ modulator analogous bang-bang digital phase-locked loop (DSBPLL). When the bang-bang-based digital PLL (BB-DPLL) cannot fully track the DCO jitter, the jitter slewing effect exacerbates the in-band noise. The proposed DSBPLL can increase the PLL filter order without using a high-order loop filter, thereby mitigating the in-band noise caused by input tracking jitter. Theoretical noise analysis confirmed that the proposed DSBPLL can reduce 54.3% of the integrated jitter from 100 kHz to 100 MHz, consistent with the measurement results. 2025-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/58396 Title: A shared aperture multiport antenna for rural wireless communication and safety monitoring using TVWS, ISM, and 5G mmWave bands Author(s): Sufian, Md Abu; Lee, Sang-Min; Choi, Domin; Lee, Jaemin; Sim, Dongkyu; Song, Minyoung; Kim, Nam Abstract: To accommodate the antenna demand for rural communication and safety monitoring a shared aperture muti-port antenna sensor is presented for three different operating frequencies covering both Sub- 6 GHz and 5G millimeter-wave bands. The antenna sensor is designed on a single substrate, while different ports are connected to different radiating elements to achieve multiple frequency responses. The simulated and measured findings show that the presented antenna can cover TV-white-space (TVWS) frequency band, 5.8 GHz ISM band, and the 5G millimeter-wave frequency band. At the TVWS band, the antenna yields an omnidirectional radiation pattern with a peak gain of 3.14 dBi. While the antenna provides a unidirectional radiation pattern at the 5.8 GHz ISM and 5G millimeter-wave band with a peak gain of 6.76 dBi and 7.68 dBi, respectively. Moreover, all the antenna ports offer a radiation efficiency of more than 92%. Additionally, the 2-port MIMO configuration at the 5G millimeter-wave band shows excellent MIMO diversity performances by utilizing the proposed novel decoupling structure, which consists of metallic stub and cavity vias. Overall performance of the proposed antenna, especially the three operating frequency band including the TVWS band, makes it a viable solution for the sensing and communication in rural areas. © The Author(s) 2025. 2025-03-31T15:00:00Z