Single-loop frequency synthesizer and electronic assembly comprising such a synthesizer.

摘要

The invention relates to the frequency synthesizers to acquisition time is very low. & br / has a single loop (1, 4, 6, 7, 8, 9) is associated with a direct digital synthesizer device (21, 22, 23), whose signal is injected into the loop by means of a mixer (7). The adjustment of the loop is carried out on np.fr and that of the digital synthesis of (ns + (k / m)) fr with np, ns, k and m whole, np, greater than ns, o & = k ≦ m, m is fixed and fr is a reference frequency; the mixture makes it possible to obtain, as the frequency of the synthesis, (np + ns + (k / m)) fr. The acquisition time of the digital synthesis is negligible and that of the loop is greatly reduced because it synthesizes of the multiple fr and not of fr / m, as with a single loop,.. & br / application to all the electronic assemblies requiring synthesizers.