JPS6477320A - Charging pump circuit - Google Patents

Charging pump circuit

Info

Publication number
JPS6477320A
JPS6477320A JP62233826A JP23382687A JPS6477320A JP S6477320 A JPS6477320 A JP S6477320A JP 62233826 A JP62233826 A JP 62233826A JP 23382687 A JP23382687 A JP 23382687A JP S6477320 A JPS6477320 A JP S6477320A
Authority
JP
Japan
Prior art keywords
charging pump
turned
trs
current value
current
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
JP62233826A
Other languages
Japanese (ja)
Inventor
Yoshiaki Okada
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 JP62233826A priority Critical patent/JPS6477320A/en
Publication of JPS6477320A publication Critical patent/JPS6477320A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To set up the output current value of a charging pump to an objective current value by adding another current source to a current source for a normal mode at the time of going a phase locked loop oscillation circuit to a rapid mode, and switching the current value of a charging pump circuit. CONSTITUTION:In case of switching the normal mode to the rapid mode, a charging pump circuit output current switching signal input terminal 9 is turned to a high level, an FET 27 is turned on and a PNP transistor(TR) 16 and an NPN TR 22 are also turned on. Even when the FET 27 is turned on and off, voltage for turning on PNP TRs 17, 18 and NPN TRs 19, 20 is not varied. Therefore, PNP TRs 15, 16 and NPN TRs 21, 22 can be operated so as not to be saturated even when the current of an output 10 of the charging pump is switched and the output current of the charging pump can be set up to the objective current value.
JP62233826A 1987-09-18 1987-09-18 Charging pump circuit Pending JPS6477320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62233826A JPS6477320A (en) 1987-09-18 1987-09-18 Charging pump circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62233826A JPS6477320A (en) 1987-09-18 1987-09-18 Charging pump circuit

Publications (1)

Publication Number Publication Date
JPS6477320A true JPS6477320A (en) 1989-03-23

Family

ID=16961169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62233826A Pending JPS6477320A (en) 1987-09-18 1987-09-18 Charging pump circuit

Country Status (1)

Country Link
JP (1) JPS6477320A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11298321A (en) * 1998-04-08 1999-10-29 Sony Corp Pll circuit
JP2018516504A (en) * 2015-04-23 2018-06-21 ザイリンクス インコーポレイテッドＸｉｌｉｎｘ Ｉｎｃｏｒｐｏｒａｔｅｄ Circuit for realizing charge / discharge switch in integrated circuit and method for realizing charge / discharge switch in integrated circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11298321A (en) * 1998-04-08 1999-10-29 Sony Corp Pll circuit
JP2018516504A (en) * 2015-04-23 2018-06-21 ザイリンクス インコーポレイテッドＸｉｌｉｎｘ Ｉｎｃｏｒｐｏｒａｔｅｄ Circuit for realizing charge / discharge switch in integrated circuit and method for realizing charge / discharge switch in integrated circuit

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