Indirect synthesis
Frequency synthesis
Article REF: E330 V1
Indirect synthesis
Frequency synthesis

Authors : Vincent GIORDANO, Enrico RUBIOLA

Publication date: November 10, 2002 | Lire en français

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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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