A novel biasing technique for low phase noise voltage controlled oscillators

Albittar I. F., DOĞAN H., Ozgun M. T.

Microelectronics Journal, vol.72, pp.120-125, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 72
  • Publication Date: 2018
  • Doi Number: 10.1016/j.mejo.2017.12.002
  • Journal Name: Microelectronics Journal
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.120-125
  • Keywords: Oscillators, VCO, PLL, Phase noise
  • Istanbul Medipol University Affiliated: Yes


This paper proposes a new biasing technique for LC-based voltage controlled oscillators to improve the phase noise performance while ensuring the current variations to be within an acceptable range. The proposed technique uses a feedback loop and a LDO to generate, sense, and regulate the output current. The oscillator has 33.3% tuning range around a center frequency of 2.4 GHz. The proposed design achieves −127.2 dBc/Hz phase noise at 1 MHz offset from 2.25 GHz while consuming 3.36 mA from a 3.3-V supply. The circuit was implemented in 65 nm UMC CMOS process. The results show that the circuit has FoM of −183.8 dBc/Hz and FoMT of −194.5 dBc/Hz at 1 MHz offset, and the current variation across PVT is within +68 µA to −63 µA range.