Programmable frequency divider

Details Programmable frequency divider Programmable frequency divider

1997-04-24

2000-07-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

327107, 327105, 327154, 377 47, 377 48, 331 2, H03B 1900

Patent

active

060878657

ABSTRACT:
A frequency divider includes a mixer having a first input connectable to a reference oscillator and a second input connectable from the reference oscillator through a frequency synthesizer to the second input of the mixer. The mixer provides an output signal to a filter, which provides a frequency divider output. The frequency synthesizer provides an output signal having a frequency of (N+1)/N or (N-1)/N times the input F.sub.IN from the reference oscillator. With the frequency synthesizer providing the signal F.sub.IN (N+1)/N, or F.sub.IN (N-1)/N, the output of the mixer provides the signal having the frequency F.sub.IN /N and can utilize a single filter to eliminate undesired mixer outputs. Further, the frequency synthesizer can be configured to utilize an oscillator which operates over the same frequency range as the reference oscillator.

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Roland E. Best, Phase-Locked Loops, Theory, Design, and Applications, McGraw-Hill Book Company, pp.216-230, Jun. 1984.

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