Phase-switched dual-mode counter circuit for a frequency...

Details Phase-switched dual-mode counter circuit for a frequency... Phase-switched dual-mode counter circuit for a frequency...

2006-10-03

2006-10-03

Callahan, Timothy P. (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Pulse multiplication or division

C377S048000

Reexamination Certificate

active

07116747

ABSTRACT:
A dual-modulus prescaler circuit for a frequency synthesizer comprises a plurality of asynchronous dividers-by-two connected in series, a phase selector unit (11) between two dividers-by-two (10, 12) and a control unit (13) for supplying control signals (S0, S1, S2) to the selector unit as a function of a selected mode. Said selector unit receives four signals phase shifted by 90° in relation to each other from a master-slave first divider and supplies a selected one of the four phase shifted signals. The control signals (S0, S1, S2) are supplied to the selector unit for selecting one of the four phase shifted signals (F2) at the output in a particular division period. As a function of the control signals supplied by the control unit (13) in one selected of the modes, the selector unit effects phase switching in each division period between two phase shifted signals selected by each branch. The second phase shifted signal i in phase lead of 90° in relation to the first phase shifted signal.

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Craninckx J. et al: “A 1.75-GHZ/3-V Dual-Modulus Divide-By-128/129 Prescaler In 0.7-MUM CMOS”, IEEE Journal of Solid-State Circuits, IEEE Inc., New York, US, vol. 31, No. 7, Jul. 1, 1996 pp. 890-897, XP000632373 ISSN: 0018-9200.

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