6. Indirect synthesis

In the preceding analog synthesis schemes, the spectral purity of the signal is limited by spurious lines from successive mixtures, which are not sufficiently attenuated by filtering. Indirect synthesis relies on the use of phase-locked loops, which inherently provide highly efficient filtering.

6.1 Indirect analog synthesis

The basic element of this type of synthesis is shown in figure 21 . The various signals at frequencies ν _b + kΔν are injected simultaneously into one of the phase detector (DP) inputs. The signal generated by the VCO is...

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Indirect synthesis

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page Direct analog synthesis

Applications. A few examples

Bibliography

References

(1) - RUTMAN (J.) - Characterization of Phase and Frequency Instabilities in Precision Frequency Sources : 15 years of Progress (Caractérisation des instabilités de phase et de fréquence : 15 ans de progrès) - . Proceedings of IEEE, 66, 9, 1048-1075 (sept. 1978).
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