| 摘要 |
A programmable frequency divider for integral and fractional divider ratios is described. It comprises a first divider circuit which is preset for an integral component of the divider ratio, and a second divider ratio with a flip flop which acts on the control input of the first divider circuit in the direction of changing the divider ratio. The object is to create a programmable frequency divider which, in addition to high resolution, also provides a large range of variation of the divider ratio. For this purpose, the flip flop is constructed as dynamic flip flop, the dynamic input of which is connected to the output of the second divider circuit. The output of the flip flop is connected to the control input of the first divider circuit via an adder which changes an integral part of the divider ratio and the integral part of the divider ratio is alternately increased and decreased at the ratio of the fractional component of the divider ratio. |
