JPS6449426A - Local oscillation circuit - Google Patents

Local oscillation circuit

Info

Publication number
JPS6449426A
JPS6449426A JP62205171A JP20517187A JPS6449426A JP S6449426 A JPS6449426 A JP S6449426A JP 62205171 A JP62205171 A JP 62205171A JP 20517187 A JP20517187 A JP 20517187A JP S6449426 A JPS6449426 A JP S6449426A
Authority
JP
Japan
Prior art keywords
output
frequency
comparator
unlock
pulse
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
JP62205171A
Other languages
Japanese (ja)
Inventor
Takeshi Toyoda
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
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP62205171A priority Critical patent/JPS6449426A/en
Publication of JPS6449426A publication Critical patent/JPS6449426A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE:To immediately respond to unlock by a radio equipment, by sending an alarm of unlock from a pulse number comparator when deviation is generated between the number of 1/M frequency division signals and that of reference pulses. CONSTITUTION:The 1/M-frequency division of the output of a VCO1 is performed by a 1/M frequency divider 2, and the 1/N-frequency division of the output of a reference signal oscillator 5 is performed by a 1/N frequency divider 6, and the phase comparison of those two signals is performed by a phase comparator 3. The output of the comparator 3 is added on a loop filter 4, and the output of the filter 4 is fed back to the VCO1, and an oscillatory frequency is controlled, thereby, a PLL operation with a stable frequency is performed. The output of the frequency divider 2 is counted by a counter 7 simultaneously with the PLL operation, and the output pulse is compared with the reference pulse at the pulse number comparator 8. And when the deviation between those numbers is generated, the alarm WS of the unlock is sent.
JP62205171A 1987-08-20 1987-08-20 Local oscillation circuit Pending JPS6449426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62205171A JPS6449426A (en) 1987-08-20 1987-08-20 Local oscillation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62205171A JPS6449426A (en) 1987-08-20 1987-08-20 Local oscillation circuit

Publications (1)

Publication Number Publication Date
JPS6449426A true JPS6449426A (en) 1989-02-23

Family

ID=16502596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62205171A Pending JPS6449426A (en) 1987-08-20 1987-08-20 Local oscillation circuit

Country Status (1)

Country Link
JP (1) JPS6449426A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5277984A (en) * 1990-02-02 1994-01-11 Nippon Zeon Co., Ltd. Magnetic recording medium comprising ferromagnetic powder, a silane compound, and a binder comprising an epoxy group and specified functional group
US5320914A (en) * 1991-06-26 1994-06-14 Nippon Zeon Co., Ltd. Magnetic recording medium comprising a styrene copolymer or an acrylic copolymer
KR101033026B1 (en) * 2008-07-28 2011-05-09 주식회사 브로던 Local Oscillator Using a Single Alarming

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5277984A (en) * 1990-02-02 1994-01-11 Nippon Zeon Co., Ltd. Magnetic recording medium comprising ferromagnetic powder, a silane compound, and a binder comprising an epoxy group and specified functional group
US5320914A (en) * 1991-06-26 1994-06-14 Nippon Zeon Co., Ltd. Magnetic recording medium comprising a styrene copolymer or an acrylic copolymer
KR101033026B1 (en) * 2008-07-28 2011-05-09 주식회사 브로던 Local Oscillator Using a Single Alarming

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