| 摘要 |
For generating a pulse train having a variable frequency, in a first step a referance frequency is divided by the combined factor Dr=N.p, wherein N and p are integers. Thus, an auxiliary pulse train is obtained. In a next step, there are included (N-1) intermediate pulses having at least approximately the same distance from each other between adjacent pulses of the auxiliary pulse train. Thereby, in total a division of the reference frequency by the factor p is obtained. This method results in an improvement of the frequency resolution by the factor N2 with respect to a method where the reference frequency is directly divided by the factor p. A circuit arrangement for carrying out this method contains a frequency divider, which issues small output pulses having the period DrTo, and (N-1) triggerable pulse emitters or generators, each of which delivering one of the aforementioned intermediate pulses.
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