Invention Grant
- Patent Title: Charge pump circuit for a PLL
- Patent Title (中): PLL的电荷泵电路
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Application No.: US10438178Application Date: 2003-05-13
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Publication No.: US06952126B2Publication Date: 2005-10-04
- Inventor: Sang Jin Byun , Beomsup Kim , Chan-Hong Park
- Applicant: Sang Jin Byun , Beomsup Kim , Chan-Hong Park
- Applicant Address: US CA Campbell
- Assignee: Berkana Wireless, Inc.
- Current Assignee: Berkana Wireless, Inc.
- Current Assignee Address: US CA Campbell
- Agency: Van Pelt, Yi & James LLP
- Priority: KR10-2001-00610465 20010929
- Main IPC: H03L7/089
- IPC: H03L7/089 ; H03L7/06

Abstract:
A technique is disclosed for providing a charge pump circuit for phase locked loop (PLL) to reduce mismatch of up/down currents and feed-through of up/down currents to voltage output. Elimination of feed-through of the input signal may be achieved by using differential switches (M1 and M2, and M3 and M4) based on DC reference voltage in the charge pump and also eliminate the mismatch of up/down currents in a wide voltage output range by applying a new replica biasing using feedback.
Public/Granted literature
- US20040004500A1 Charge pump circuit for a PLL Public/Granted day:2004-01-08
Information query
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