Title:
STABLE PHASE LOCKED LOOP HAVING SEPARATED POLE
Document Type and Number:
WIPO Patent Application WO2001011782
Kind Code:
A9
Abstract:
A phase locked loop circuit having a loop filter (120) including a variable resistance (R1) for normal loop operation and for fast acquisition has improved stability by defining a loop pole (132) separate from the loop filter. The loop pole remains constant during transition periods of the filter resistance. The loop pole remains constant while loop bandwidth is varied for either phase acquisition or normal operation, and the ratio of bandwidth to pole varies only linearly which makes the phase locked loop more stable during the bandwidth adjustment.
Inventors:
MOMTAZ AFSHIN
Application Number:
PCT/US2000/021801
Publication Date:
July 11, 2002
Filing Date:
August 09, 2000
Export Citation:
Assignee:
NEWPORT COMMUNICATIONS INC (US)
International Classes:
H03L7/089; H03L7/093; H03L7/099; H03L7/107; H03L7/18; (IPC1-7): H03L7/08; H03L7/093
Download PDF:
Previous Patent: CLOCK SYNCHRONIZATION SYSTEM AND METHOD
Next Patent: FRACTIONAL- N FREQUENCY SYNTHESISER
Next Patent: FRACTIONAL- N FREQUENCY SYNTHESISER