Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Reexamination Certificate
2002-07-31
2004-07-27
Nguyen, Linh M. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
C377S047000
Reexamination Certificate
active
06768353
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to wireless communication systems and equipment, and more specifically to a method and apparatus for realizing a prescaler suitable for use therein.
BACKGROUND OF THE INVENTION
Prescalers are well known and have found their way into many applications in wireless communication systems and equipment. The flexibility desired in modem wireless communication systems has created a need for a prescaler having a multi-modulus divide ratio to achieve a wide range of operating frequencies. Furthermore, the increasingly higher transmission frequencies of modern communication systems have strained the speed limits of prior-art prescalers. In addition, battery life considerations together with stringent size requirements for portable communication devices have brought about an emphatic need for low power consumption.
Thus, what is needed is a method and apparatus for realizing a prescaler that can provide an easily controlled multi-modulus divide ratio and operate at frequencies beyond one GHz, while consuming little power.
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H. Pohjonen and H. Ronkainen; “A 1 GHz CMOS Prescaler For RF Synthesizers”; CH2458-8/88/0000-0377; 1988 IEEE, pp. 377-380.
Yaun and Svenson; “Fast CMOS Nonbinary Divider and Counter”; Electronics Letters 24thJun. 1993; vol. 29 No. 13; pp. 1222-1223.
Carralero Cesar
Davis Darrell
Salvi Raul
Bethards Charles W.
Freescale Semiconductor Inc.
Nguyen Linh M.
Posz & Bethards, PLC
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