Title :
Requirements for Time-to-Digital Converters in the context of digital-PLL based Frequency Synthesis and GSM Modulation
Author :
Vollenbruch, Ulrich ; Liu, Yue ; Bauernfeind, Thomas ; Pittorino, Tindaro ; Neubauer, Volker ; Mayer, Thomas ; Maurer, Linus
Author_Institution :
Linz Center of Mechatronics GmbH
Abstract :
A key issue in proceeding the digitization of phase-locked loops (PLLs) is the realization of proper phase detectors in the digital domain. This paper presents simulative analysis of the properties and requirements for time-to-digital converters (TDCs) used for phase comparison in digitized fractional-N modulators with two-point modulation. Effects due to quantization of the TDC on frequency synthesis as well as GSM modulation quality are considered, defining the realization requirements for a transmitter
Keywords :
digital phase locked loops; modulation; phase detectors; quantisation (signal); GSM modulation; fractional-N modulators; frequency synthesis; modulation quality; phase comparison; phase detectors; phase-locked loops; time-to-digital converters; two-point modulation; Analytical models; Detectors; Digital modulation; Digital-to-frequency converters; Frequency conversion; Frequency synthesizers; GSM; Phase detection; Phase locked loops; Phase modulation; Frequency synthesizers; GSM; Time-to-Digital Converter; digital PLL; phase detector; phase locked loops; ¿¿-modulation;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249748
