JPS5720037A - Channel changeover system of frequency synthesizer - Google Patents

Channel changeover system of frequency synthesizer

Info

Publication number
JPS5720037A
JPS5720037A JP9470980A JP9470980A JPS5720037A JP S5720037 A JPS5720037 A JP S5720037A JP 9470980 A JP9470980 A JP 9470980A JP 9470980 A JP9470980 A JP 9470980A JP S5720037 A JPS5720037 A JP S5720037A
Authority
JP
Japan
Prior art keywords
frequency
time
frequency divider
constant
changeover
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
JP9470980A
Other languages
Japanese (ja)
Inventor
Tomoo Ishikawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9470980A priority Critical patent/JPS5720037A/en
Publication of JPS5720037A publication Critical patent/JPS5720037A/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
    • H03L7/18—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
    • H03L7/1972—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 reducing the locking time interval

Abstract

PURPOSE:To shorten a channel changeover time and to achieve an accurate high- speed channel changeover by increasing the natural frequency of a PLL circuit on the start of the channel changeover and by making the frequency stationary at the point in time when a rough adjustment is made. CONSTITUTION:Between a reference frequency generator 1 and a phase comparator 5, a variable frequency divider 8 is provided, and its frequency division number is set in a changeover controlling circuit 9. During a channel chageover, this controlling circuit 9 switches the frequency division ratios of the frequency divider 8 and a variable frequency divider 4, inputting the output of a VCO3, and the constant of a loop filter 6. When the output frequency of the VCO3 is varied by varying the frequency divison ratio of the frequency divider 4 constituting a PLL circuit, a reference comparison frequency is mltiplied by (n) (n; integer) only in a constant time after the start of the switching, and at the same time, the frequency division number of the frequency divider 8 is equalized to a value obtained by dividing the frequency division number in a stationary state where the switching is copleted by (n). Further, the constant of the filter 6 is adjusted to a value matching with a nearly (n) fold reference frequency to change channels of a synthesizer accurately in a short time.
JP9470980A 1980-07-11 1980-07-11 Channel changeover system of frequency synthesizer Pending JPS5720037A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9470980A JPS5720037A (en) 1980-07-11 1980-07-11 Channel changeover system of frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9470980A JPS5720037A (en) 1980-07-11 1980-07-11 Channel changeover system of frequency synthesizer

Publications (1)

Publication Number Publication Date
JPS5720037A true JPS5720037A (en) 1982-02-02

Family

ID=14117680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9470980A Pending JPS5720037A (en) 1980-07-11 1980-07-11 Channel changeover system of frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS5720037A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61128629A (en) * 1984-11-27 1986-06-16 Nec Corp Pll modulator
EP0218266A2 (en) 1984-05-02 1987-04-15 Fuji Photo Film Co., Ltd. Silver halide color photographic light-sensitive material
JPS636910A (en) * 1986-06-26 1988-01-12 Toshiba Corp Channel setting method for frequency synthesizer
JPS63174427A (en) * 1987-01-14 1988-07-18 Matsushita Electric Ind Co Ltd Variable frequency oscillator
JPH01201002A (en) * 1988-02-06 1989-08-14 Mitsui Toatsu Chem Inc Iodine recovery from waste liquid containing organic iodine
JPH01224203A (en) * 1988-03-03 1989-09-07 Mitsui Toatsu Chem Inc Method for recovering iodine from organic iodine compound-containing waste liquor
JPH01294502A (en) * 1988-05-23 1989-11-28 Mitsui Toatsu Chem Inc Method for recovering iodine from waste liquor containing organic iodine compound
JPH01294503A (en) * 1988-05-23 1989-11-28 Mitsui Toatsu Chem Inc Method for recovering iodine from waste liquor containing organic iodine compound
JPH02268519A (en) * 1989-03-17 1990-11-02 Icom Inc Pll frequency synthesizer
JPH0338921A (en) * 1989-07-05 1991-02-20 Icom Inc Pll frequency synthesizer
DE3939709A1 (en) * 1989-12-01 1991-06-06 Bosch Gmbh Robert METHOD FOR TUNING A RADIO TRANSMITTER AND / OR RECEIVER
JPH06284004A (en) * 1993-03-30 1994-10-07 Nec Corp Frequency synthesizer
DE19748885A1 (en) * 1997-11-05 1999-05-20 Ericsson Telefon Ab L M Phase locked loop with improvements in phase jitter, MTIEs, following speed and locking speed
DE19946200A1 (en) * 1999-09-27 2001-05-03 Infineon Technologies Ag Phase locked loop

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218266A2 (en) 1984-05-02 1987-04-15 Fuji Photo Film Co., Ltd. Silver halide color photographic light-sensitive material
JPS61128629A (en) * 1984-11-27 1986-06-16 Nec Corp Pll modulator
JPS636910A (en) * 1986-06-26 1988-01-12 Toshiba Corp Channel setting method for frequency synthesizer
JPS63174427A (en) * 1987-01-14 1988-07-18 Matsushita Electric Ind Co Ltd Variable frequency oscillator
JPH01201002A (en) * 1988-02-06 1989-08-14 Mitsui Toatsu Chem Inc Iodine recovery from waste liquid containing organic iodine
JPH01224203A (en) * 1988-03-03 1989-09-07 Mitsui Toatsu Chem Inc Method for recovering iodine from organic iodine compound-containing waste liquor
JPH01294502A (en) * 1988-05-23 1989-11-28 Mitsui Toatsu Chem Inc Method for recovering iodine from waste liquor containing organic iodine compound
JPH01294503A (en) * 1988-05-23 1989-11-28 Mitsui Toatsu Chem Inc Method for recovering iodine from waste liquor containing organic iodine compound
JPH02268519A (en) * 1989-03-17 1990-11-02 Icom Inc Pll frequency synthesizer
JPH0338921A (en) * 1989-07-05 1991-02-20 Icom Inc Pll frequency synthesizer
DE3939709A1 (en) * 1989-12-01 1991-06-06 Bosch Gmbh Robert METHOD FOR TUNING A RADIO TRANSMITTER AND / OR RECEIVER
EP0444237A1 (en) * 1989-12-01 1991-09-04 Robert Bosch Gmbh Turning method for a radio transmitter and/or receiver apparatus
JPH06284004A (en) * 1993-03-30 1994-10-07 Nec Corp Frequency synthesizer
DE19748885A1 (en) * 1997-11-05 1999-05-20 Ericsson Telefon Ab L M Phase locked loop with improvements in phase jitter, MTIEs, following speed and locking speed
US6288614B1 (en) 1997-11-05 2001-09-11 Telefonaktiebolaget Lm Ericsson (Publ) Phase-locked loop with improvements on phase jitter, MTIE tracking speed and locking speed
DE19748885C2 (en) * 1997-11-05 2001-11-29 Ericsson Telefon Ab L M Phase locked loop with improvements in phase jitter, MTIEs, following speed and locking speed
DE19946200A1 (en) * 1999-09-27 2001-05-03 Infineon Technologies Ag Phase locked loop
US6621356B2 (en) 1999-09-27 2003-09-16 Infineon Technologies Ag Phase-locked loop with short transient recovery duration and small interference signal component

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