This work introduces a low phase-noise (PN) wideband voltage-controlled-oscillator (VCO) by proposing five ports transformer in 0.18-μm CMOS technology. The proposed VCO uses five ports transformer and operates in the low band when all the pMOS-nMOS cross-coupled VCO components are activated, whereas this VCO operates in the high band using only part of the transformer, and an nMOS cross-coupled core. The transformer is designed using the top metal layer (M6) and the first inductor is meander line U-shaped center tap inductor, while the second inductor consists of two shunted octagonal loops to increase the quality (Q-) factor compared with using a single-loop inductor. The wideband switched transformer VCO achieves a measured frequency tuning range (FTR) of 16.4-17.1 GHz with a PN of -113.3 dBc/Hz at 1-MHz offset, and from 17 to 17.9 GHz
Research Member
Research Department
Research Date
Research Year
2022
Research Journal
IEEE Microwave and Wireless Components Letters
Research Publisher
IEEE
Research Vol
Volume 32, Issue 10
Research_Pages
1207-1210
Research Website
https://scholar.google.com/scholar?oi=bibs&cluster=17912069632843015387&btnI=1&hl=en
Research Abstract