Abstract
Reference spur is a limiting performance factor in an integer-N phase-locked loop (PLL). In this paper, we investigate the effect of VCO gain, ripple magnitude in VCO tuning voltage and reference frequency with reference spur magnitude. Normally, VCO gain and reference frequency are chosen according to needed system requirement, leaving only the ripple voltage on the VCO control signal to be minimised in order to minimize the reference spur. The ripple voltage is mainly contributed by current mismatch, current leakage, switching delay and discrepancies between the rise and fall times in charge pump circuit. In addition, loop filter is also affecting the ripple voltage. In this paper, we consider these effects analytically to predict ripple voltage in the VCO tuning voltage and hence calculate the reference spur magnitude of the PLL device.
| Original language | English |
|---|---|
| Title of host publication | ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings |
| Pages | 659-664 |
| Number of pages | 6 |
| Volume | 2 |
| DOIs | |
| Publication status | Published - 2012 |
| Event | 2012 4th International Conference on Intelligent and Advanced Systems, ICIAS 2012 - Kuala Lumpur Duration: 12 Jun 2012 → 14 Jun 2012 |
Other
| Other | 2012 4th International Conference on Intelligent and Advanced Systems, ICIAS 2012 |
|---|---|
| City | Kuala Lumpur |
| Period | 12/6/12 → 14/6/12 |
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Keywords
- charge pump
- current mismatch
- loop filter
- phase/frequency detector (PFD)
- reference spur
- tuning voltage
- voltage controlled oscillator (VCO)
ASJC Scopus subject areas
- Artificial Intelligence
- Information Systems
Cite this
An accurate analytical spur model for an integer-N phase-locked loop. / Kamal, Noorfazila; Al-Sarawi, Said; Abbott, Derek.
ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings. Vol. 2 2012. p. 659-664 6306096.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - An accurate analytical spur model for an integer-N phase-locked loop
AU - Kamal, Noorfazila
AU - Al-Sarawi, Said
AU - Abbott, Derek
PY - 2012
Y1 - 2012
N2 - Reference spur is a limiting performance factor in an integer-N phase-locked loop (PLL). In this paper, we investigate the effect of VCO gain, ripple magnitude in VCO tuning voltage and reference frequency with reference spur magnitude. Normally, VCO gain and reference frequency are chosen according to needed system requirement, leaving only the ripple voltage on the VCO control signal to be minimised in order to minimize the reference spur. The ripple voltage is mainly contributed by current mismatch, current leakage, switching delay and discrepancies between the rise and fall times in charge pump circuit. In addition, loop filter is also affecting the ripple voltage. In this paper, we consider these effects analytically to predict ripple voltage in the VCO tuning voltage and hence calculate the reference spur magnitude of the PLL device.
AB - Reference spur is a limiting performance factor in an integer-N phase-locked loop (PLL). In this paper, we investigate the effect of VCO gain, ripple magnitude in VCO tuning voltage and reference frequency with reference spur magnitude. Normally, VCO gain and reference frequency are chosen according to needed system requirement, leaving only the ripple voltage on the VCO control signal to be minimised in order to minimize the reference spur. The ripple voltage is mainly contributed by current mismatch, current leakage, switching delay and discrepancies between the rise and fall times in charge pump circuit. In addition, loop filter is also affecting the ripple voltage. In this paper, we consider these effects analytically to predict ripple voltage in the VCO tuning voltage and hence calculate the reference spur magnitude of the PLL device.
KW - charge pump
KW - current mismatch
KW - loop filter
KW - phase/frequency detector (PFD)
KW - reference spur
KW - tuning voltage
KW - voltage controlled oscillator (VCO)
UR - http://www.scopus.com/inward/record.url?scp=84867939650&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867939650&partnerID=8YFLogxK
U2 - 10.1109/ICIAS.2012.6306096
DO - 10.1109/ICIAS.2012.6306096
M3 - Conference contribution
AN - SCOPUS:84867939650
SN - 9781457719677
VL - 2
SP - 659
EP - 664
BT - ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings
ER -