Frequency divider

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control

Reexamination Certificate

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Details

C327S115000

Reexamination Certificate

active

07741886

ABSTRACT:
A frequency divider including a first frequency-dividing unit, a second frequency-dividing unit, a selecting unit, and a counting unit is provided. The first frequency-dividing unit receives an input signal and divides a frequency of the input signal for outputting a plurality of phase signals, wherein phases of the phase signals are mutually different. The selecting unit is connected to the first frequency-dividing unit for selecting one of the phase signals according to a control signal, so as to output an inner signal. The second frequency-dividing unit is coupled to the selecting unit for dividing a frequency of the inner signal to serve an output signal. The counting unit is coupled to the selecting unit for counting the inner signal and outputting a counting result as the control signal. Therefore, the output signal with about 50% duty cycle can be provided.

REFERENCES:
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patent: 6501815 (2002-12-01), Stansell
patent: 6583647 (2003-06-01), Kim et al.
patent: 6998882 (2006-02-01), Chung
patent: 7012985 (2006-03-01), Nix
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patent: 2005/0063505 (2005-03-01), Dubash et al.
patent: 2005/0242848 (2005-11-01), Sun et al.
patent: 2006/0071717 (2006-04-01), El-Kacimi et al.

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