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Abstract

A digital/analog hybrid frequency synthesizer having a digital frequency synthesizer for digitally generating an analog output signal of a predetermined frequency within a frequency range of f to f+.DELTA.f; an input stage analog frequency synthesizer for, receiving the digital frequency synthesizer output signal and I analog input stage input signals, each input stage input signal separated in frequency from a next one by a frequency increment of .DELTA.f wherein a first one and a last one of the input stage input signals are respectively of a frequency of f.sub.A and f.sub.A +(I-1).DELTA.f, selecting one input stage input signal from the input stage input signals, mixing the selected input stage input signal with the digital frequency synthesizer output signal and providing a resultant input stage output signal; and an output stage analog frequency synthesizer for, receiving the input stage output signal and K analog output stage input signals, each output stage input signal separated in frequency from a next one by a frequency increment of I.DELTA.f wherein a first one and a last one of the output stage input signals are respectively of a frequency of f.sub.N and f.sub.N +(K-1)I.DELTA.f, selecting one output stage input signal from the output stage input signals, mixing the selected output stage input signal with the input stage output signal and providing a resultant output stage output signal. Additional intermediate frequency stages may be employed to facilitate greater bandwidth expansion.

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