Frequency-hopped quadrature frequency synthesizer in 0.13-μm technology

Narasimha R. Lanka, Satwik A. Patnaik, Ramesh A. Harjani

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


This paper presents a Wireless-USB/WiMedia-compliant fast-hopping frequency synthesizer architecture with quadrature outputs based on sub-harmonic injection-locking. The synthesizer features a cross-coupled quadrature digitally-controlled oscillator, that is injection-locked to a sub-harmonic frequency. An intuitive closed-form expression for the dynamics of the quadrature injection-locked oscillator and a technique to achieve fast frequency-hopping, are presented. The overall architecture, based on this technique, is a CMOS-only implementation and has been fabricated in a 0.13-μ m SiGe BiCMOS process. On-chip mixers have been implemented to measure the quadrature accuracy of the outputs. Measurement results indicate lock-times of less than 2.5 ns, a locked phase noise of -114 dBc/Hz at 1 MHz offset and a quadrature accuracy of better than 0.5°. The frequency synthesizer (excluding output buffers) occupies an area of 0.27 mm2 and consumes 14.5 mW of power. The best and worst case spur suppression achieved are 47 and 31 dB, respectively. This is the lowest power fast-hopping quadrature frequency synthesizer that has been reported to date.

Original languageEnglish (US)
Article number5766062
Pages (from-to)2021-2032
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Issue number9
StatePublished - Sep 1 2011


  • Adler's equation
  • Colpitts oscillator
  • Injection locking
  • fast-hopping
  • fast-locking
  • frequency settling
  • frequency-hopped spread spectrum (FHSS)
  • frequency-shift keying (FSK)
  • fundamental locking
  • harmonic locking
  • injection-locked oscillator (ILO)
  • lock acquisition
  • transient behavior
  • ultra-wide-band (UWB)

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