Flip-flop, frequency divider and RF circuit having the same

Details Flip-flop, frequency divider and RF circuit having the same Flip-flop, frequency divider and RF circuit having the same

2011-07-05

2011-07-05

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

Reexamination Certificate

active

07973574

ABSTRACT:
A flip-flop, and a frequency divider and an RF circuit using the flip-flop. The frequency divider, which receives a first signal and generates a second signal by dividing a frequency of the first signal, including a plurality of flip-flops that each latch and output a signal based on the first signal; and at least one switch unit that is switched in response to a control signal to modify a signal transfer path between the plurality of the flip-flops, wherein a different number of flip-flops are activated in response to each first and second status of the control signal so that the frequency of the first signal is divided by different multiples.

REFERENCES:
patent: 5754615 (1998-05-01), Colavin
patent: 7554369 (2009-06-01), Kirichenko
patent: 7602877 (2009-10-01), Shimada
patent: 2008/0258781 (2008-10-01), Song et al.
patent: 2005-287001 (2005-10-01), None
patent: 20060067189 (2006-06-01), None
patent: 20070061243 (2007-06-01), None

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