Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-05-04
2008-12-09
Chang, Joseph (Department: 2817)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C331S016000, C331S017000
Reexamination Certificate
active
07463873
ABSTRACT:
System and method for providing type-II (and higher order) phase-locked loops (PLLs) with a fast signal acquisition mode. A preferred embodiment comprises a wireless communication device having a loop filter with a proportional loop gain path (proportional loop gain circuit 1115 ) and an integral loop gain block (integral loop gain block 1120 ). The proportional loop gain path is used during signal acquisition to provide large loop bandwidth, hence fast signal acquisition of a desired signal. Then, during the PLL's signal tracking phase, the intergral loop gain block is enabled and its output is combined with output from the proportional loop gain path to provide higher order filtering of the desired signal. An offset that may be present due to the use of the proportional loop gain path can be measured and subtracted to help improve signal tracking settling times.
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“All Digital Phase-Locked Loop: Concepts, Design and Applications”, Y. R. Shayan and T. Le-Ngoc, IEEE Proceedings F. Communications, Radar & Signal Processing, Institution of Electrical Engineers. Stevenage, GB, vol. 136, No. 1, Part F, Feb. 1, 1989, pp. 53-56.
Leipold Dirk
Muhammad Khurram
Staszewski Robert B.
Brady III Wade James
Chang Joseph
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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