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GB2393863B - PLL synthesizer in a cellular phone - Google Patents

PLL synthesizer in a cellular phone

Info

Publication number
GB2393863B
GB2393863B GB0327631A GB0327631A GB2393863B GB 2393863 B GB2393863 B GB 2393863B GB 0327631 A GB0327631 A GB 0327631A GB 0327631 A GB0327631 A GB 0327631A GB 2393863 B GB2393863 B GB 2393863B
Authority
GB
United Kingdom
Prior art keywords
cellular phone
pll synthesizer
pll
synthesizer
cellular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB0327631A
Other versions
GB0327631D0 (en
GB2393863A (en
Inventor
Megumi Endo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001279863A external-priority patent/JP2003087116A/en
Application filed by NEC Corp filed Critical NEC Corp
Publication of GB0327631D0 publication Critical patent/GB0327631D0/en
Publication of GB2393863A publication Critical patent/GB2393863A/en
Application granted granted Critical
Publication of GB2393863B publication Critical patent/GB2393863B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
    • 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
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
    • H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
GB0327631A 2001-09-14 2002-09-13 PLL synthesizer in a cellular phone Expired - Fee Related GB2393863B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001279863A JP2003087116A (en) 2001-09-14 2001-09-14 Pll synthesizer
GB0221337A GB2380340B (en) 2001-09-14 2002-09-13 PLL synthesizer for a cellular phone

Publications (3)

Publication Number Publication Date
GB0327631D0 GB0327631D0 (en) 2003-12-31
GB2393863A GB2393863A (en) 2004-04-07
GB2393863B true GB2393863B (en) 2004-09-15

Family

ID=31980023

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0327631A Expired - Fee Related GB2393863B (en) 2001-09-14 2002-09-13 PLL synthesizer in a cellular phone

Country Status (1)

Country Link
GB (1) GB2393863B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669722A2 (en) * 1994-02-28 1995-08-30 Nec Corporation PLL circuit having shortened locking time
JPH0964733A (en) * 1995-08-26 1997-03-07 Nec Corp Frequency synthesizer
JPH11191735A (en) * 1994-01-19 1999-07-13 Japan Radio Co Ltd PLL synthesizer and control method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11191735A (en) * 1994-01-19 1999-07-13 Japan Radio Co Ltd PLL synthesizer and control method thereof
EP0669722A2 (en) * 1994-02-28 1995-08-30 Nec Corporation PLL circuit having shortened locking time
JPH0964733A (en) * 1995-08-26 1997-03-07 Nec Corp Frequency synthesizer

Also Published As

Publication number Publication date
GB0327631D0 (en) 2003-12-31
GB2393863A (en) 2004-04-07

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20130110 AND 20130116

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130913