Frequency division

Details Frequency division Frequency division

2007-01-23

2007-01-23

Moe, Aung (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S260000, C455S180300, C455S313000, C327S156000

Reexamination Certificate

active

10883641

ABSTRACT:
The invention relates to a method of operating a frequency divider. The frequency divider includes a plurality of divider cells arranged in a chain. Each divider cell is adapted to divide a frequency of an input signal with one of two enabled division ratios in accordance with an applied division ratio control signal, and each divider cell but the last is adapted to provide a frequency divided signal as an input signal for a respective next divider cell. In order to enable a Fractional-N division, the method comprises receiving and buffering a new division ratio control signal for each of the divider cells, and synchronizing an application of the buffered division ratio control signals to the divider cells with a status of a current division cycle. The invention relates equally to a corresponding frequency divider, PLL frequency synthesizer, RF front end, device and system.

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“A Family of Low-Power Truly Modular Programmable Dividers in Standard 0.35- μm CMOS Technology”, Vaucher et al., IEEE Journal of Solid-State Circuits, vol. 35, No. 7, Jul. 2000, pp. 1039-1045.

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