4.02-5.48 GHz wideband VCO with coupling reduction and small Kvco variation

Zou, Wei; Ren, Daming; Zhang, Kefeng; Zou, Xuecheng

doi:10.1080/00207217.2020.1756437

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Circuit Design and Analysis1

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2023

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“…Adjustable capacitances are three-ended MOS varactor and double-ended reverse bias diodes, among which the diode varactor can achieve a smaller tuning range. In addition to the dual-path structure, the delay cell also includes an AMOS varactor pair in which the D and S are connected [31]. Because the AMOS varactor has different requirements on process structure, foundries provide support for AMOS device.…”

Section: Circuit Design and Analysismentioning

confidence: 99%

Design and analysis of a low phase noise low power ring-VCO

Zou,

Zhang,

Cheng

et al. 2023

IEICE Electron. Express

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A low phase noise low power ring voltage-controlled oscillator (Ring-VCO) is proposed for phase-locked loops (PLLs) in the 802.11ah communication protocol band. A three-stage Ring-VCO with dual-path structure delay cells is designed to meet the high performance requirements of Internet of Things. The main noise source in the differential delay cell can be eliminated at the differential output, thus reducing phase noise. Implemented in an old TSMC 0.18 µm CMOS process, the Ring-VCO achieves a tuning range of 343.56-974.56 MHz. The phase noise at 1 MHz offset varies from -116.28 to -108.74 dBc/Hz, and the current consumed is 2.27 mA.

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Section: Circuit Design and Analysismentioning

confidence: 99%