JPS6415820A - Integrated circuit - Google Patents

Integrated circuit

Info

Publication number
JPS6415820A
JPS6415820A JP62170920A JP17092087A JPS6415820A JP S6415820 A JPS6415820 A JP S6415820A JP 62170920 A JP62170920 A JP 62170920A JP 17092087 A JP17092087 A JP 17092087A JP S6415820 A JPS6415820 A JP S6415820A
Authority
JP
Japan
Prior art keywords
high frequency
clock
reference signal
integrated circuit
constitution
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
JP62170920A
Other languages
Japanese (ja)
Inventor
Yutaka Okada
Tomoyuki Watabe
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62170920A priority Critical patent/JPS6415820A/en
Publication of JPS6415820A publication Critical patent/JPS6415820A/en
Pending legal-status Critical Current

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  • Semiconductor Integrated Circuits (AREA)

Abstract

PURPOSE:To suppress the electromagnetic interference by producing a high frequency clock in an integrated circuit IC based on a reference signal of a low frequency applied from outside. CONSTITUTION:A reference signal of a low frequency supplied from outside and a reference signal of a high frequency produced by a divider 5 undergo the phase synchronization in an IC 1 via a PLL containing a phase comparator 2, an LPF 3, a VCO 4, etc. Thus an internal clock of a high frequency is produced and used by a logic circuit part 6, an A/D converter 7, a D/A converter 8, etc., in the IC 1. Then a clock line and an earth line which form a loop serve as antennas to reduce the high frequency electromagnetic radiation in such a constitution where no external clock of a high frequency is used. As a result, the electromagnetic interference is suppressed for a VTR, a microcomputer, etc.
JP62170920A 1987-07-10 1987-07-10 Integrated circuit Pending JPS6415820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62170920A JPS6415820A (en) 1987-07-10 1987-07-10 Integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62170920A JPS6415820A (en) 1987-07-10 1987-07-10 Integrated circuit

Publications (1)

Publication Number Publication Date
JPS6415820A true JPS6415820A (en) 1989-01-19

Family

ID=15913803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62170920A Pending JPS6415820A (en) 1987-07-10 1987-07-10 Integrated circuit

Country Status (1)

Country Link
JP (1) JPS6415820A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04139964A (en) * 1990-10-01 1992-05-13 Sega Enterp Ltd Synchronizing system for plural devices
US5565816A (en) * 1995-08-18 1996-10-15 International Business Machines Corporation Clock distribution network
JPH0954629A (en) * 1995-08-16 1997-02-25 Nec Corp Microcomputer
EP0779659A2 (en) 1995-12-15 1997-06-18 Nec Corporation Semiconductor integrated circuit
US5774015A (en) * 1994-12-15 1998-06-30 Nec Corporation Compact semiconductor integrated circuit capable of reducing electromagnetic emission

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04139964A (en) * 1990-10-01 1992-05-13 Sega Enterp Ltd Synchronizing system for plural devices
US5774015A (en) * 1994-12-15 1998-06-30 Nec Corporation Compact semiconductor integrated circuit capable of reducing electromagnetic emission
JPH0954629A (en) * 1995-08-16 1997-02-25 Nec Corp Microcomputer
US5565816A (en) * 1995-08-18 1996-10-15 International Business Machines Corporation Clock distribution network
EP0779659A2 (en) 1995-12-15 1997-06-18 Nec Corporation Semiconductor integrated circuit

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