TY - GEN
T1 - (INVITED) analysis and modeling of noise folding and spurious emission in wideband fractional-N synthesizers
AU - Khalil, Waleed
AU - Hedayati, Hiva
AU - Bakkaloglu, Bertan
AU - Kiaei, Sayfe
PY - 2008/9/22
Y1 - 2008/9/22
N2 - Fraetional-N synthesizers are subject to generation of undesired spurious energy due to both linear and nonlinear processes. Previously, we presented an accurate modeling of the nonlinear, time-varying nature of the phase frequency detector (PFD), charge pump and frequency divider [1]. The proposed modeling technique was able to predict in-band spur power levels within 1.8 dB accuracy. In this paper we demonstrate using the proposed model that the close-in phase noise increase due intermodulation of the ΣΔ high frequency quantization noise is independent of the synthesizer reference frequency, which is in contrast to commonly used linear models. A behavioral model is also used to show that the more detrimental near-integer in-band spurs can be generated by cross-coupling between the synthesizers's various building blocks.
AB - Fraetional-N synthesizers are subject to generation of undesired spurious energy due to both linear and nonlinear processes. Previously, we presented an accurate modeling of the nonlinear, time-varying nature of the phase frequency detector (PFD), charge pump and frequency divider [1]. The proposed modeling technique was able to predict in-band spur power levels within 1.8 dB accuracy. In this paper we demonstrate using the proposed model that the close-in phase noise increase due intermodulation of the ΣΔ high frequency quantization noise is independent of the synthesizer reference frequency, which is in contrast to commonly used linear models. A behavioral model is also used to show that the more detrimental near-integer in-band spurs can be generated by cross-coupling between the synthesizers's various building blocks.
KW - Fractional-N frequency synthesizers
KW - Phase noise
KW - Quantization noise
KW - Sigma-delta modulation
KW - Spurious emissions
UR - http://www.scopus.com/inward/record.url?scp=51849138425&partnerID=8YFLogxK
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U2 - 10.1109/RFIC.2008.4561438
DO - 10.1109/RFIC.2008.4561438
M3 - Conference contribution
AN - SCOPUS:51849138425
SN - 9781424418091
T3 - Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
SP - 291
EP - 294
BT - Proceedings of the 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
T2 - 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
Y2 - 15 June 2008 through 17 June 2008
ER -