Title:
IMPROVED CHARGE PUMP SYSTEM FOR FAST LOCKING PHASE LOCK LOOP
Document Type and Number:
WIPO Patent Application WO2005004332
Kind Code:
A3
Abstract:
A charge pump system for a fast locking phase lock loop includes a set n of charge pump units; and a control logic circuit for enabling the set of n charge pump units to produce up and down charge pulses with a nominal charge pump mismatch in a wide bandwidth mode; and in a narrow bandwidth mode enabling at least a subset of the n charge pump units sequentially to produce an average charge pump mismatch in narrow bandwidth mode that matches the nominal charge pump mismatch in the wide bandwidth mode.
Inventors:
KEAVENEY MICHAEL F (IE)
LYDEN COLIN (IE)
WALSH PATRICK (IE)
LYDEN COLIN (IE)
WALSH PATRICK (IE)
Application Number:
PCT/US2004/020550
Publication Date:
May 26, 2005
Filing Date:
June 25, 2004
Export Citation:
Assignee:
ANALOG DEVICES INC (US)
KEAVENEY MICHAEL F (IE)
LYDEN COLIN (IE)
WALSH PATRICK (IE)
KEAVENEY MICHAEL F (IE)
LYDEN COLIN (IE)
WALSH PATRICK (IE)
International Classes:
H03D13/00; H03K3/017; H03K3/0231; H03L7/00; H03L7/06; F04B; H02M; H03L; H04B; (IPC1-7): H03L7/06
Foreign References:
| US6230280B1 | 2001-05-08 | |||
| US5889828A | 1999-03-30 |
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