JPS6418316A - Charge pump circuit - Google Patents

Charge pump circuit

Info

Publication number
JPS6418316A
JPS6418316A JP62175569A JP17556987A JPS6418316A JP S6418316 A JPS6418316 A JP S6418316A JP 62175569 A JP62175569 A JP 62175569A JP 17556987 A JP17556987 A JP 17556987A JP S6418316 A JPS6418316 A JP S6418316A
Authority
JP
Japan
Prior art keywords
current
changeover
mode
charge pump
decreases slowly
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
JP62175569A
Other languages
Japanese (ja)
Inventor
Shuichi Hashimoto
Toshibumi Hatagami
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 JP62175569A priority Critical patent/JPS6418316A/en
Publication of JPS6418316A publication Critical patent/JPS6418316A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To reduce the gap by providing a means varying a current continuously in a synchronizing circuit of a magnetic recorder having a charge pump circuit varying a control voltage so as to switch the mode thereby eliminating the effect of unmatching. CONSTITUTION:In the changeover from the FAST mode into the NORMAL mode, when a changeover switch 25 is turned off, the potential at a point (x) rises slowly by a time constant comprising a resistor 21 and a capacitor 23. Thus, the current of a constant current source 10 decreases slowly from 9mA to zero mA. That is, the DC current flowing to the filter via a changeover switch 13 decreases slowly from 10mA to 1mA. Similarly, the current of the constant current source 16 decreases slowly from 9mA to zero mA. The means varying the current continuously is a circuit comprising resistors 21, 22 and capacitors 23, 24. Thus, through the continuous changeover from the FAST to the NORMAL mode, the effect of unbalance is reduced and the data read/ write is started more quickly.
JP62175569A 1987-07-14 1987-07-14 Charge pump circuit Pending JPS6418316A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62175569A JPS6418316A (en) 1987-07-14 1987-07-14 Charge pump circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62175569A JPS6418316A (en) 1987-07-14 1987-07-14 Charge pump circuit

Publications (1)

Publication Number Publication Date
JPS6418316A true JPS6418316A (en) 1989-01-23

Family

ID=15998373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62175569A Pending JPS6418316A (en) 1987-07-14 1987-07-14 Charge pump circuit

Country Status (1)

Country Link
JP (1) JPS6418316A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161492A (en) * 1989-12-28 1992-11-10 Mazda Motor Corporation Intake system for multi-cylinder engine
JPH0629836A (en) * 1992-04-29 1994-02-04 Internatl Business Mach Corp <Ibm> Constant-gain phased-lock loop
JP2009267775A (en) * 2008-04-25 2009-11-12 Renesas Technology Corp Pll circuit, and serial interface circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161492A (en) * 1989-12-28 1992-11-10 Mazda Motor Corporation Intake system for multi-cylinder engine
JPH0629836A (en) * 1992-04-29 1994-02-04 Internatl Business Mach Corp <Ibm> Constant-gain phased-lock loop
JP2009267775A (en) * 2008-04-25 2009-11-12 Renesas Technology Corp Pll circuit, and serial interface circuit

Similar Documents

Publication Publication Date Title
MY112702A (en) Reproducing circuit for a magnetic head.
CA2019778A1 (en) Charge pump circuit
EP0158512A3 (en) Reset circuit
JPS57198579A (en) Disc reproducing device
EP0370737A3 (en) Low voltage inhibit control apparatus
JPS6418316A (en) Charge pump circuit
EP0350077A3 (en) control apparatus for an a.c. generator for automobile
MY106391A (en) Magneto-resistive sensor
JPS5320309A (en) Magnetic reproducer
JPS5766309A (en) Device for sensing rotation of rotating body
JPS55132521A (en) Recording circuit for flexible disc unit
JPS56113843A (en) Electromagnetic spring
GB8416782D0 (en) Internal high voltage(vpp)rise control circuit
JPS52104276A (en) Electric power. dc signal transducer
JPS5577013A (en) Recording circuit in magnetic recorder
JPS6438665A (en) Sample holding circuit
JPS57154965A (en) Constant current source type filter having self-bias function
JPS57123551A (en) Setting circuit for applied voltage
JPS5756279A (en) Magnetic fluid recorder
JPS55132514A (en) Magnetic recording and reproducing system
JPS5514577A (en) Recording adjustment unit of tape recorder
JPS60170006A (en) Bias oscillation device for magnetic recorders, etc.
KR960030148A (en) Digital information reproducing apparatus and method using electric head system
JPS5720930A (en) Auto tracking system of optical disk
EP0306817A3 (en) Magnetic recording and reproducing apparatus of rotating head type