This paper presents a K-band CMOS cross-coupled pair voltage-controlled oscillator (VCO) that utilizes the varactor-only capacitor network. The proposed circuit features low parasitics and a compact capacitor network, such that the varactor in the analog tuning path directly affects the oscillation frequency with a large gain of the VCO, and the varactor in the digital tuning path results in minimal noise sources, thus achieving low phase noise for the automotive FMCW radar application. This VCO was designed using TSMC 65 nm technology, and the post-layout simulation results show a stable oscillation across 18–19.2 GHz, a minimum phase noise of −105.9 and −128 dBc/Hz at 1- and 10-MHz offset frequencies while dissipating 21 mW of power from a 1 V supply. Furthermore, no notable variations in phase noise are observed across the oscillation frequency tuning range. It reveals a figure of merit (FOM) of −178.3 dBc/Hz while using a varactor-only capacitor array and occupying a small chip area.

Citeureup Village, RW 06, located in Bandung Regency, West Java Province, is a regional area with low-level economy. The Covid-19 pandemic has made it worse and adding difficulties to the villagers. On the other hand, this area also often experiences flooding with an erratic pattern. Therefore, efforts are needed to improve local food security, economy, and flood disaster mitigation for the Citeureup Village community. Efforts has been made by Telkom University, some through activities carried out by students of the Undergraduate Program in Engineering Physics (TF), which were to carry out community service activities funded by the Village Development and Empowerment Holistic Program (PHP2D) in 2020. These activities were decided by decree number 29/E2/KM/2020. The results of these activities are the construction of a Hydroponic Greenhouse (HG) on  ??10m x 4m and biopore infiltration holes as many as 45 hole constructions throughout RW 06 Citeureup Village. Three months after construction, HG's existence has succeeded in improving Citeureup Villagers behavior and practical knowledge in hydroponic and biopore systems from 21% to 98%. As conclusion, Telkom University has succeeded in playing role in improving knowledge, local food security, economy, and reducing flood inundation at Citereup Village.