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JPS5634240A - Fundamental frequency switching control system in frequency synthesizing unit - Google Patents

Fundamental frequency switching control system in frequency synthesizing unit

Info

Publication number
JPS5634240A
JPS5634240A JP10963879A JP10963879A JPS5634240A JP S5634240 A JPS5634240 A JP S5634240A JP 10963879 A JP10963879 A JP 10963879A JP 10963879 A JP10963879 A JP 10963879A JP S5634240 A JPS5634240 A JP S5634240A
Authority
JP
Japan
Prior art keywords
current
auxiliary
memories
digital values
comparators
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.)
Pending
Application number
JP10963879A
Other languages
Japanese (ja)
Inventor
Hiroshi Sunayama
Hiroshi Ogasawara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10963879A priority Critical patent/JPS5634240A/en
Publication of JPS5634240A publication Critical patent/JPS5634240A/en
Pending 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
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To shorten the time required for anomaly detection, by switching current and auxiliary units when the time change rate of the output level of the LPF exceeds a fixed value in respect to current and auxiliary units for fundamental frequency generation dependent upon a PLL circuit. CONSTITUTION:In current and auxiliary fundamental frequency generating units consisting of main oscillators 1 and 1' and PLL circuits 2 and 2', outputs of LPFs 22 and 22' are subjected to A/D conversion by converters 6 and 6' and are stored in memories 7 and 7'. Digital values stored in memories and digital values of A/D converters are compared with each other by comparators 8 and 8'. If memories and comparators use fundamental frequencies fi and fi' of main oscillators as sampling pulses, comparators detect equivalently the difference between two digital values different in period, namely, the time change rate of the LPF output signal level. In case that this difference exceeds a fixed value, change-over switches 3 and 3' are switched through control circuit 5 to perform switching from the current unit to the auxiliary unit or from the auxiliary unit to the current unit.
JP10963879A 1979-08-30 1979-08-30 Fundamental frequency switching control system in frequency synthesizing unit Pending JPS5634240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10963879A JPS5634240A (en) 1979-08-30 1979-08-30 Fundamental frequency switching control system in frequency synthesizing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10963879A JPS5634240A (en) 1979-08-30 1979-08-30 Fundamental frequency switching control system in frequency synthesizing unit

Publications (1)

Publication Number Publication Date
JPS5634240A true JPS5634240A (en) 1981-04-06

Family

ID=14515352

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10963879A Pending JPS5634240A (en) 1979-08-30 1979-08-30 Fundamental frequency switching control system in frequency synthesizing unit

Country Status (1)

Country Link
JP (1) JPS5634240A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084493A (en) * 1989-12-19 1992-01-28 Union Carbide Chemicals & Plastics Technology Corporation Water soluble crayon compositions
US5084098A (en) * 1989-12-19 1992-01-28 Olson James D Water soluble crayon compositions
US6039797A (en) * 1999-02-01 2000-03-21 Binney & Smith Inc. Washable marking composition
JP2011155367A (en) * 2010-01-26 2011-08-11 Furuno Electric Co Ltd Reference frequency generating apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084493A (en) * 1989-12-19 1992-01-28 Union Carbide Chemicals & Plastics Technology Corporation Water soluble crayon compositions
US5084098A (en) * 1989-12-19 1992-01-28 Olson James D Water soluble crayon compositions
US6039797A (en) * 1999-02-01 2000-03-21 Binney & Smith Inc. Washable marking composition
JP2011155367A (en) * 2010-01-26 2011-08-11 Furuno Electric Co Ltd Reference frequency generating apparatus

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