Dual-Band VCO Using High Quality Factor Two Orthogonally Located Inductors in 0.18-<inline-formula> <tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula>m CMOS Technology

Islam Mansour, Marwa Mansour, Mohamed Aboualalaa, Ahmed Allam, Adel B. Abdel-Rahman, Ramesh K. Pokharel, Mohammed Abo-Zahhad

Research output: Contribution to journalArticlepeer-review

Abstract

This work introduces a new topology for designing low-phase noise (PN) dual-band voltage-controlled oscillator (VCO) by proposing orthogonally located inductors in 0.18-<inline-formula> <tex-math notation="LaTeX">$\mu $</tex-math> </inline-formula>m CMOS. The inductors are implemented using five metal layers keeping the lowest layer empty to maximize the quality (<inline-formula> <tex-math notation="LaTeX">$Q)$</tex-math> </inline-formula> factor. The first inductor is two halves shunted octagonal loops using the top layer (M<inline-formula> <tex-math notation="LaTeX">$_{6})$</tex-math> </inline-formula> and utilized in cross-coupled VCO, while the second inductor is formed by four C-shaped shunted inductors using the lower four layers M<inline-formula> <tex-math notation="LaTeX">$_{\mathrm{5-2}}$</tex-math> </inline-formula> and used in current-reuse (CR) VCO. The M<inline-formula> <tex-math notation="LaTeX">$_{6}$</tex-math> </inline-formula> inductor improves the <inline-formula> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula>-factor by more than 25%over one loop inductor in the frequency band of interest, while the M<inline-formula> <tex-math notation="LaTeX">$_{\mathrm{5-2}}$</tex-math> </inline-formula> inductor uses four shunt layers to boost the <inline-formula> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula>-factor by 28% in <inline-formula> <tex-math notation="LaTeX">$K$</tex-math> </inline-formula>-band compared to the single-layer inductor. The VCO oscillates from 22.36 to 23.4 GHz with PN of <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>112.4 dBc/Hz at 1 MHz and figure of merit (FoM) of <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>188.8 dBc/Hz, while the CR VCO has tuning range from 23.8 to 25.7 GHz with a PN of <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>107 dBc/Hz at 1 MHz and FoM <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>185.8 dBc/Hz.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
DOIs
Publication statusAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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