TY - JOUR
T1 - An Injection-Locked Frequency-Tracking ΣΔ Direct Digital Frequency Synthesizer
AU - Lyles, Umar J.
AU - Bakkaloglu, Bertan
AU - Kiaei, Sayfe
AU - Kiaei, Sayfe
N1 - Funding Information:
Manuscript received August 22, 2006; revised November 3, 2006. This work was supported by the Western Alliance to Expand Student Oppurtinities and the National Science Foundation under Grant. HRD-0602425. This paper was recommended by Associate Editor G. Manganaro. U. Lyles is with Battery Monitoring Solutions, Texas Instruments Inc., Melbourne, FL 32904 USA (e-mail: umar.lyles@ti.com). T. Copani, B. Bakkaloglu, and S. Kiaei are with the Ira A. Fulton School of Engineering, Arizona State University, Tempe, AZ 85287-08406 USA. Digital Object Identifier 10.1109/TCSII.2007.892406
PY - 2007/5/7
Y1 - 2007/5/7
N2 - A bandpass (BP) sigma-delta modulator (ΣΔM)-based direct digital frequency synthesizer (DDS) architecture is presented. The DDS output is passed through a single-bit, second-order BPΣΔM, shaping quantization noise out of the signal band. The single-bit BPΣΔM is then injection locked to an LC-tank oscillator, which provides a tracking BP filter response within its locking range, suppressing the BPΣΔM 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 BPΣΔM-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.
AB - A bandpass (BP) sigma-delta modulator (ΣΔM)-based direct digital frequency synthesizer (DDS) architecture is presented. The DDS output is passed through a single-bit, second-order BPΣΔM, shaping quantization noise out of the signal band. The single-bit BPΣΔM is then injection locked to an LC-tank oscillator, which provides a tracking BP filter response within its locking range, suppressing the BPΣΔM 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 BPΣΔM-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.
KW - Direct digital frequency synthesizer (DDS)
KW - injection locking
KW - oscillator phase noise
KW - sigma-delta modulator (Σ Δ M)
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U2 - 10.1109/TCSII.2007.892406
DO - 10.1109/TCSII.2007.892406
M3 - Article
AN - SCOPUS:34248652164
VL - 54
SP - 402
EP - 406
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
SN - 1549-7747
IS - 5
ER -