User:BORGATO Pierandrea/sandbox
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--BORGATO Pierandrea 19:21, 26 May 2014 (UTC)
This page serves as a testing area and development space for BORGATO Pierandrea at Wikibooks, and is not a book. You can create your own sandbox. See also: Using Wikibooks | Editing Wikitext | Help:Templates | Wikibooks:Sandbox | Template:Template sandbox |
edit in progress[edit | edit source]
Sandbox[edit | edit source]
Examples of software PLLs:[edit | edit source]
http://arachnoid.com/phase_locked_loop/
Effective Q of a PLL, Ext REF & Note[edit | edit source]
References in the book to ITU 8251 etc..
The CDR (strictly speaking the CR = PLL) may incorporate a loop filter that sets the jitter transfer BW with its pole and that also squeezes to naught the steady state error with its zero set at least a couple of decades below the pole[1].
Notes from ITU[edit | edit source]
About holdover transients [5]
External References and Notes[edit | edit source]
- ↑ The frequency range of interest for a regenerator (jitter transfer) around its cut-off frequency is about +/- 2 decades: G.783-2006 03 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks; 15.1.3 Jitter and wander transfer, page 246; ... the jitter transfer measurement is made over the frequency range fL to fH. The lower frequency fL is set to fC/100 (where fC is the –3 dB corner frequency), and fH is defined as .. 100*fC … Jitter above fH is generally agreed to be insignificant relative to regenerator jitter accumulation, and low levels of in-spec jitter generation can easily be confused with an out-of-spec jitter transfer measurement when attempting to measure jitter transfer at high input/output attenuation levels (i.e., below –40 dB). The limits set for fL at fC/100 will always include the frequency at which maximum gain peaking occurs, and limiting jitter transfer measurements to frequencies between fL and fH will help limit testing time.
- ↑ 1MA98: dB or not dB? Rohde & Schwarz Application Note http://www2.rohde-schwarz.com/file_5613/1MA98_4E.pdf
- ↑ Telecommunications: Glossary of Telecommunication Terms Federal Standard 1037C August 7, 1996 http://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm
- ↑ The frequency range of interest for a regenerator (jitter transfer) around its cut-off frequency is about +/- 2 decades: G.783-2006 03 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks; 15.1.3 Jitter and wander transfer, page 246; ... the jitter transfer measurement is made over the frequency range fL to fH. The lower frequency fL is set to fC/100 (where fC is the –3 dB corner frequency), and fH is defined as .. 100*fC … Jitter above fH is generally agreed to be insignificant relative to regenerator jitter accumulation, and low levels of in-spec jitter generation can easily be confused with an out-of-spec jitter transfer measurement when attempting to measure jitter transfer at high input/output attenuation levels (i.e., below –40 dB). The limits set for fL at fC/100 will always include the frequency at which maximum gain peaking occurs, and limiting jitter transfer measurements to frequencies between fL and fH will help limit testing time.
- ↑ G.8251-201009 The control of jitter and wander within the optical transport network (OTN); A.8 Transient response
- ↑ G.8251-201009 The control of jitter and wander within the optical transport network (OTN); IV.2 Model 1; IV.2.1 Model details ...linear model for a phase-locked loop (PLL)...loop filter .. with transfer function 1+b/s,... (i.e. 2nd order type 2)