Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Yann Donnelly"'
Autor:
Dawei Mai, Yann Donnelly, Michael Peter Kennedy, Stefano Tulisi, James Breslin, Patrick Griffin, Michael Connor, Stephen Brookes, Brian Shelly, Mike Keaveney
Fractional-N frequency synthesizers that use a digital Δ-Σ modulator (DDSM) to control the feedback divider can exhibit spurious tones that move about in the frequency domain; these are known colloquially as ``walking'' or wandering spurs. Building
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80f487684d4177352bab36629a75ac13
https://hdl.handle.net/10468/13106
https://hdl.handle.net/10468/13106
Autor:
Brian Shelly, Dawei Mai, Stephen Brookes, Patrick Griffin, Michael Keaveney, Yann Donnelly, Michael Connor, James Breslin, Stefano Tulisi, Michael Peter Kennedy
Publikováno v:
ESSCIRC
Apart from the well-known nonlinearity-induced fixed spurs, a DDSM divider-based fractional- $N$ frequency synthesizer can manifest spurs with time-varying frequency offsets from the carrier; these are called wandering spurs. This paper presents expe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e801736d5b040fcc7b81fbe629d7d758
https://doi.org/10.1109/esscirc53450.2021.9567841
https://doi.org/10.1109/esscirc53450.2021.9567841
Autor:
Yann Donnelly, Michael Peter Kennedy
The interaction between quantization noise intro-duced by the divider controller and memoryless nonlinearities in a fractional-N PLL causes fractional spurs to occur. This paper presents a comprehensive theory to explain why combinations of quantizer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::134ff0f81233a3f7146c3a747c73c364
https://doi.org/10.36227/techrxiv.14987115.v1
https://doi.org/10.36227/techrxiv.14987115.v1
Autor:
Michael Peter Kennedy, Yann Donnelly
Publikováno v:
IEEE Transactions on Circuits and Systems I: Regular Papers. 66:2426-2439
Wandering spurs are a little-studied phenomenon seen in MASH and SQ-digital delta-sigma modulators. They take the form of frequency-modulated spurs which periodically appear in-band. Since modulators are often employed as divide ratio controllers in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b9a9cc28c873f578096cc90a562b926
https://doi.org/10.1109/tcsi.2019.2893435
https://doi.org/10.1109/tcsi.2019.2893435
Autor:
Michael F. Keaveney, James Breslin, Sanganagouda Patil, Stephen Brookes, Patrick Griffin, Brian Shelly, Yann Donnelly, Stefano Tulisi, Michael Peter Kennedy, Ciaran Curtin
A 4.48-GHz type-II charge pump fractional- ${N}$ PLL implemented in a 0.18- $\mu \text{m}$ BiCMOS process is presented. The divider controller’s output is processed using a novel block, the probability mass redistributor, which statistically reconf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1e7272df73a92932c2265360ce9ec27
https://hdl.handle.net/10468/9672
https://hdl.handle.net/10468/9672
Autor:
Michael Peter Kennedy, Yann Donnelly
Integer boundary spurs appear in the passband of the loop response of fractional- ${N}$ phase lock loops and are, therefore, a potentially significant component of the phase noise. In spite of measures guaranteeing spur-free modulator outputs, the in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d9c753ac6e9e7ad7cc97e9526c93047
https://hdl.handle.net/10468/8507
https://hdl.handle.net/10468/8507
Autor:
Brian Shelly, Michael F. Keaveney, Stephen Brookes, Patrick Griffin, Sanganagouda Patil, James Breslin, Stefano Tulisi, Yann Donnelly, Ciaran Curtin, Michael Peter Kennedy
Publikováno v:
ISSCC
The instantaneous divide value of the multimodulus divider in the feedback path of a fractional-N PLL is determined by a divider controller, which is usually implemented as a digital delta-sigma modulator $(\mathrm (D)\Delta \Sigma \mathrm (M))$. A d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8dc841c6f5d8970d31c596a4dde32d8d
https://doi.org/10.1109/isscc.2019.8662327
https://doi.org/10.1109/isscc.2019.8662327
Publikováno v:
ISCAS
The MASH Digital Delta-Sigma Modulator (DDSM) based divider controller represents a speed bottleneck in state of the art commercial PLL-based fractional-N frequency synthesizers. As next generation systems require higher phase detector frequencies, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dea82e8752a042487c50f4da149d81d8
https://doi.org/10.1109/iscas.2018.8351624
https://doi.org/10.1109/iscas.2018.8351624
Autor:
Michael Peter Kennedy, Yann Donnelly
Publikováno v:
2017 13th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME).
Noise-shaping quantizers are used in fractional-N PLLs to provide a fractional-mean modulation signal to the loop divider. A drawback to this method is the introduction of phase noise due to the changing divide ratio. Noise shaping techniques are typ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2632589437992fbba2fd6b01ed628d1c
https://doi.org/10.1109/prime.2017.7974146
https://doi.org/10.1109/prime.2017.7974146
Autor:
Yann Donnelly, Michael Peter Kennedy
Publikováno v:
ICECS
The noise-shaping quantizer is commonly used in Fractional-N Frequency Synthesizers to provide a control signal to the feedback divider with a fractional mean component and high-pass spectral properties. The Digital Delta-Sigma Modulator (DΔΣM) is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b0d1fc954f12d3bbd63d73dbaa35cc1
https://doi.org/10.1109/icecs.2016.7841235
https://doi.org/10.1109/icecs.2016.7841235