Phase noise improvement and noise modeling of type-I ADPLL with non-linear quantization effects
2015 (English)In: NORCHIP 2014 - 32nd NORCHIP Conference: The Nordic Microelectronics Event, IEEE conference proceedings, 2015Conference paper (Refereed)
This paper presents a phase noise improvement method for fine tuning of type-I ADPLL by exploiting its nonlinear quantization effects. When quantization step approaches the same orders of magnitude of standard deviation of input noise, quantization effects become nonlinear, and additive noise modeling of quantization effects is no longer applicable. By proper offsetting the input signals in this case, the feedback loop of ADPLL can be very sensitive to frequency phase deviation. It results in a larger loop bandwidth, and in turn smaller in-band phase noise than in linear quantization case. A theoretic s-domain noise model is proposed to quantify the phase noise in nonlinear case. Results are verified in Modelsim simulations. Proposed method offers possibility of achieving lower phase noise by lower quantization resolution and less circuit design efforts.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2015.
ADPLL, Noise Model, Nonlinear, Quantization
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-167405DOI: 10.1109/NORCHIP.2014.7004732ScopusID: 2-s2.0-84921498163ISBN: 9781479954421OAI: oai:DiVA.org:kth-167405DiVA: diva2:815481
32nd NORCHIP Conference, NORCHIP 2014, 27 October 2014-28 October 2014, Tampere, Finland
QC 201506012015-06-012015-05-222015-11-13Bibliographically approved