TW200620836A - Low noise charge pump for PLL-based frequence synthesis - Google Patents

Low noise charge pump for PLL-based frequence synthesis

Info

Publication number
TW200620836A
TW200620836A TW093137161A TW93137161A TW200620836A TW 200620836 A TW200620836 A TW 200620836A TW 093137161 A TW093137161 A TW 093137161A TW 93137161 A TW93137161 A TW 93137161A TW 200620836 A TW200620836 A TW 200620836A
Authority
TW
Taiwan
Prior art keywords
charge
pump
pll
low noise
charge pump
Prior art date
Application number
TW093137161A
Other languages
Chinese (zh)
Other versions
TWI283968B (en
Inventor
Chi-Hung Lin
Original Assignee
Via Tech Inc
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 Via Tech Inc filed Critical Via Tech Inc
Priority to TW93137161A priority Critical patent/TWI283968B/en
Publication of TW200620836A publication Critical patent/TW200620836A/en
Application granted granted Critical
Publication of TWI283968B publication Critical patent/TWI283968B/en

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

Abstract

A low noise charge pump for use in a PLL-based frequency synthesizer. The charge pump includes a timing controller and a plurality of charge-pump circuits. The timing controller receives a reference signal to generate a plurality of enable signals having non-overlapping phases, where the frequency of each enable signal is equal to that of the reference signal divided by the number of the enable signals. The charge-pump circuits are coupled in parallel and operate in a time-interleaved manner according to the enable signals. In response to a first and second control signal, the charge-pump circuits are able to generate respective output currents which are multiplexed together to form a charge-pump current.
TW93137161A 2004-12-02 2004-12-02 Low noise charge pump for PLL-based frequence synthesis TWI283968B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW93137161A TWI283968B (en) 2004-12-02 2004-12-02 Low noise charge pump for PLL-based frequence synthesis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW93137161A TWI283968B (en) 2004-12-02 2004-12-02 Low noise charge pump for PLL-based frequence synthesis

Publications (2)

Publication Number Publication Date
TW200620836A true TW200620836A (en) 2006-06-16
TWI283968B TWI283968B (en) 2007-07-11

Family

ID=39430931

Family Applications (1)

Application Number Title Priority Date Filing Date
TW93137161A TWI283968B (en) 2004-12-02 2004-12-02 Low noise charge pump for PLL-based frequence synthesis

Country Status (1)

Country Link
TW (1) TWI283968B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI415393B (en) * 2007-01-30 2013-11-11 Mosaid Technologies Inc Phase shifting in dll/pll
TWI415394B (en) * 2010-04-13 2013-11-11 Elite Semiconductor Esmt Phase lock loop circuit and the method using the same
TWI465034B (en) * 2007-08-03 2014-12-11 Wolfson Microelectronics Plc Amplifier circuit and method of amplifying a signal in an amplifier circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI415393B (en) * 2007-01-30 2013-11-11 Mosaid Technologies Inc Phase shifting in dll/pll
TWI465034B (en) * 2007-08-03 2014-12-11 Wolfson Microelectronics Plc Amplifier circuit and method of amplifying a signal in an amplifier circuit
TWI415394B (en) * 2010-04-13 2013-11-11 Elite Semiconductor Esmt Phase lock loop circuit and the method using the same

Also Published As

Publication number Publication date
TWI283968B (en) 2007-07-11

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