Loop filter approximations for PLLs

Author

Carlosena, A. ; Ugarte, M. ; López-Martín, A.J.

Author_Institution

Dept. Electr. & Electron. Eng., Univ. Publica de Navarra, Pamplona

fYear

2008

fDate

10-13 Aug. 2008

Firstpage

21

Lastpage

24

Abstract

Phase Noise Frequency response in a Phase Locked Loop cannot be freely determined, since it is constrained by the Loop structure and the Loop Filter (LF) shape. Therefore, Filter Approximation Theory is of no use in this case. However, we show in this paper that some general relations can be established between the Loop Filter, Loop Gain, and Phase Noise Frequency response, making it possible to apply basic filter theory concepts to PLL design. This approach can be seen as complementary to the conventional way PLLs are analysed.

Keywords

approximation theory; frequency response; low-pass filters; phase locked loops; phase noise; PLL; filter approximation theory; loop filter approximations; loop structure; phase locked loop; phase noise frequency response; Band pass filters; Filtering theory; Frequency response; Frequency synthesizers; Low pass filters; Phase locked loops; Phase noise; Shape; Transfer functions; Voltage-controlled oscillators; Analog Signal Processing; Feedback Systems; Frequency Synthesizers; Loop Filters; Modulators; Phase-Locked Loops;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on

Conference_Location

Knoxville, TN

ISSN

1548-3746

Print_ISBN

978-1-4244-2166-4

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2008.4616726

Filename

4616726