6 Citations (Scopus)

Abstract

A bandpass (BP) sigma-delta modulator (∑ΔM)-based direct digital frequency synthesizer (DDS) architecture is presented. The DDS output is passed through a single-bit, second-order BP∑ΔM, shaping quantization noise out of the signal band. The single-bit BP∑ΔM is then injection locked to an LC-tank oscillator, which provides a tracking BP filter response within its locking range, suppressing the BP∑ΔM out of band quantization noise. The instantaneous digital frequency control word input of the DDS is used to tune the noise shaper center frequency, achieving up to 20% tuning range around the fundamental. The BP∑ΔM-based synthesizer is fabricated in a 0.25-μm digital CMOS process with four layers of metal. With a second-order BP noise shaper and a 44-MHz LC tank oscillator, an SFDR of 73 dB at a 2-MHz bandwidth and phase noise lower than - 105 dBc/Hz at a 10-kHz offset is achieved.

Original languageEnglish (US)
Pages (from-to)402-406
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume54
Issue number5
DOIs
StatePublished - May 2007

Fingerprint

Frequency synthesizers
Phase noise
Bandpass filters
Modulators
Tuning
Bandwidth
Metals

Keywords

  • Direct digital frequency synthesizer (DDS)
  • Injection locking
  • Oscillator
  • Phase noise
  • Sigma-delta modulator ∑ΔM)

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

An injection-locked frequency-tracking ∑Δ direct digital frequency synthesizer. / Lyles, Umar J.; Bakkaloglu, Bertan; Kiaei, Sayfe; Kiaei, Sayfe.

In: IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 54, No. 5, 05.2007, p. 402-406.

Research output: Contribution to journalArticle

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