Frequency division methods and circuits are provided for producing an
output clock signal with a frequency related to the frequency of an input
clock signal by a predetermined factor. The method and circuit rely on
the input clock signal and on feedback from the output signal to produce
an intermediate signal. The frequency of the intermediate signal is
divided to produce the output clock signal. The method and circuit may be
implemented using few circuit components. In an exemplary embodiment, the
method and circuit may be used to produce an output clock signal with a
frequency that is two-and-a-half times lower than the frequency of the
input clock signal.