IT1252241B - Metodo e sistema per la riduzione del jitter di una struttura a pll (phase loked loop) caratterizzato da un rapporto razionale tra le le frequenze d`ingresso e di uscita. - Google Patents
Metodo e sistema per la riduzione del jitter di una struttura a pll (phase loked loop) caratterizzato da un rapporto razionale tra le le frequenze d`ingresso e di uscita.Info
- Publication number
- IT1252241B IT1252241B ITMI913303A ITMI913303A IT1252241B IT 1252241 B IT1252241 B IT 1252241B IT MI913303 A ITMI913303 A IT MI913303A IT MI913303 A ITMI913303 A IT MI913303A IT 1252241 B IT1252241 B IT 1252241B
- Authority
- IT
- Italy
- Prior art keywords
- jitter
- input
- pll
- loked
- phase
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 2
- 238000001914 filtration Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/197—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
- H03L7/1974—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division
- H03L7/1976—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division using a phase accumulator for controlling the counter or frequency divider
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
Il trovato concerne un metodo per il controllo di PLL in cui il rapporto fra la frequenza di uscita e quella di ingresso é un numero razionale. Esso si caratterizza per la presenza di un sistema di controllo del divisore programmabile di frequenza presente nel PLL.In base all'errore di fase prodotto da un comparatore si effettua una stima dell'errore di fase dell'oscillatore dalla quale si ricava un segnale di comando, del divisore di frequenza. Lo scopo del sistema di controllo è quello di trasformare il jitter a bassa frequenza sul segnale di uscita dal PLL in jitter ad alta frequenza facilmente eliminabile con un opportuno filtraggio del segnale.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI913303A IT1252241B (it) | 1991-12-10 | 1991-12-10 | Metodo e sistema per la riduzione del jitter di una struttura a pll (phase loked loop) caratterizzato da un rapporto razionale tra le le frequenze d`ingresso e di uscita. |
AU29811/92A AU657820B2 (en) | 1991-12-10 | 1992-12-01 | Method of reducing jitter in phase-locked loop |
DE69223220T DE69223220T2 (de) | 1991-12-10 | 1992-12-04 | Verfahren und System zur Phasenjitterreduzierung in einem Phasenregelkreis mit gebrochenem N-Teilerverhältnis |
EP92120705A EP0546466B1 (en) | 1991-12-10 | 1992-12-04 | Method and system for reducing the jitter of a PLL (Phase Locked Loop) structure characterized by a rational ratio between input and output frequencies |
ES92120705T ES2112292T3 (es) | 1991-12-10 | 1992-12-04 | Metodo y sistema para reducir la fluctuacion de una estructura pll (bucle de enganche de fase) caracterizada por una relacion racional entre frecuencias de entrada y de salida. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI913303A IT1252241B (it) | 1991-12-10 | 1991-12-10 | Metodo e sistema per la riduzione del jitter di una struttura a pll (phase loked loop) caratterizzato da un rapporto razionale tra le le frequenze d`ingresso e di uscita. |
Publications (3)
Publication Number | Publication Date |
---|---|
ITMI913303A0 ITMI913303A0 (it) | 1991-12-10 |
ITMI913303A1 ITMI913303A1 (it) | 1993-06-10 |
IT1252241B true IT1252241B (it) | 1995-06-05 |
Family
ID=11361295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITMI913303A IT1252241B (it) | 1991-12-10 | 1991-12-10 | Metodo e sistema per la riduzione del jitter di una struttura a pll (phase loked loop) caratterizzato da un rapporto razionale tra le le frequenze d`ingresso e di uscita. |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0546466B1 (it) |
AU (1) | AU657820B2 (it) |
DE (1) | DE69223220T2 (it) |
ES (1) | ES2112292T3 (it) |
IT (1) | IT1252241B (it) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6011815A (en) * | 1997-09-16 | 2000-01-04 | Telefonaktiebolaget Lm Ericsson | Compensated ΔΣ controlled phase locked loop modulator |
US6047029A (en) * | 1997-09-16 | 2000-04-04 | Telefonaktiebolaget Lm Ericsson | Post-filtered delta sigma for controlling a phase locked loop modulator |
US7282967B2 (en) | 2003-10-30 | 2007-10-16 | Avago Technologies General Ip ( Singapore) Pte. Ltd. | Fixed frequency clock output having a variable high frequency input clock and an unrelated fixed frequency reference signal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8907316D0 (en) * | 1989-03-31 | 1989-09-13 | Plessey Co Plc | Fractional'n'synthesisers |
CA2003428C (en) * | 1989-11-21 | 1999-12-14 | Thomas Atkin Denning Riley | Frequency synthesizer |
GB2238434B (en) * | 1989-11-22 | 1994-03-16 | Stc Plc | Frequency synthesiser |
US5055802A (en) * | 1990-04-30 | 1991-10-08 | Motorola, Inc. | Multiaccumulator sigma-delta fractional-n synthesis |
-
1991
- 1991-12-10 IT ITMI913303A patent/IT1252241B/it active IP Right Grant
-
1992
- 1992-12-01 AU AU29811/92A patent/AU657820B2/en not_active Ceased
- 1992-12-04 DE DE69223220T patent/DE69223220T2/de not_active Expired - Fee Related
- 1992-12-04 ES ES92120705T patent/ES2112292T3/es not_active Expired - Lifetime
- 1992-12-04 EP EP92120705A patent/EP0546466B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU657820B2 (en) | 1995-03-23 |
ITMI913303A0 (it) | 1991-12-10 |
DE69223220T2 (de) | 1998-07-09 |
EP0546466B1 (en) | 1997-11-19 |
ES2112292T3 (es) | 1998-04-01 |
AU2981192A (en) | 1993-06-17 |
DE69223220D1 (de) | 1998-01-02 |
ITMI913303A1 (it) | 1993-06-10 |
EP0546466A1 (en) | 1993-06-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19971128 |