1. A-189 dBc/Hz FoMT Wide Tuning Range VCO Using Q-Factor Enhancement Technique
- Author
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Zhu Li, Geliang Yang, Rong Wang, Zhigong Wang, Zhiqun Li, Faen Liu, and Qin Li
- Subjects
Radiation ,Materials science ,business.industry ,Electrical engineering ,dBc ,LC circuit ,Condensed Matter Physics ,Chip ,Voltage-controlled oscillator ,CMOS ,Q factor ,Phase noise ,Optoelectronics ,Flicker noise ,Electrical and Electronic Engineering ,business ,Instrumentation - Abstract
A 28-GHz voltage-controlled oscillator (VCO) with a wide tuning range and a low phase noise is presented in this paper. A PMOS-only cross-coupled pair with a lower flicker noise is exploited to provide the negative resistance. The mechanisms for enhancing the Q-factor of the LC tank at millimeter-wave (mm-wave) frequencies are analyzed and applied to optimize the proposed VCO design to obtain a low phase noise. To guarantee accurate oscillating frequencies, distributed interconnections are carefully modeled by EM simulations. Fabricated in a standard 90-nm CMOS process, the proposed VCO achieves a wide tuning range of 20.1 %, from 25 to 30.66 GHz and a low phase noise of −105.47 dBc/Hz at 1-MHz offset. The current of the core circuit is 10.5 mA under a single 1.2-V supply. The core area of the chip is 0.38 mm × 0.24 mm.
- Published
- 2015
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