An Ultra-Low-Power Octave-Tuning VCO IC With a Single Analog Voltage-Controlled Novel Varactor

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Abstract

In this paper, an ultra-low-power octave-tuning voltage-controlled oscillator (VCO) integrated circuit (IC) is proposed, using a novel varactor with a single control voltage. The novel varactor including VCO-gain (<italic>K</italic> <inline-formula> <tex-math notation="LaTeX">$_{\rm VCO}$</tex-math> </inline-formula>) improving structure consists of two parallel-connected inversion-mode MOS (I-MOS)-based varactors with shifted bias and an NMOSFET operating as a variable resistor. This novel varactor is able to give a large capacitance variation with a single analog control voltage. The proposed wideband VCO IC implementing this novel varactor is designed, fabricated, and evaluated fully on-wafer in 40-nm CMOS SOI technology. The proposed wideband VCO IC has exhibited a completely continuous measured tuning range (TR) of 67.9% from 3.2 to 6.49 GHz. The measured dc power consumption is from 0.35 to 1.36 mW throughout the whole TR under a supply voltage of 0.36 V. This is an extremely low dc power consumption among the reported sub-10-GHz octave-tuning VCO ICs so far. The measured peak figure-of-merit including TR (FoM<inline-formula> <tex-math notation="LaTeX">$_{\rm T}$</tex-math> </inline-formula>) of the proposed VCO IC is 210.4 dBc/Hz with a carrier frequency of 6.49 GHz.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Analog integrated circuit (IC)
  • Capacitance
  • CMOS SOI
  • Integrated circuits
  • Logic gates
  • low power
  • tuning range (TR)
  • varactor
  • Varactors
  • Voltage control
  • voltage-controlled oscillator (VCO)
  • Voltage-controlled oscillators
  • Wideband
  • wideband

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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