Patent ID: 7508275

Claim:
An indirect analog synthesizer comprising: an offset loop; a source, injected into the offset loop; a fractional frequency multiplier; wherein the fractional frequency multiplier creates the source, the fractional frequency multiplier comprises: a source fractional frequency multiplier input; a frequency multiplier with an input and an output; a first switch with an input and a first and second output; a power splitter with an input and a first and second output; a mixer with a first input, a second input, and an output, a frequency divider with an input and an output; a filter bank with an input and two outputs; a second switch with a first input, a second input, a third input and an output; and a programmable frequency divider; wherein the source fractional frequency multiplier input feeds into the frequency multiplier input, the frequency multiplier output feeds into the first switch input, the first output of the first switch feeds into the first input of the second switch, the second output of the first switch feeds into the power splitter input, the first output of the power splitter feeds into the first input of the mixer, the second output of the power splitter feeds into the frequency divider input, the frequency divider output feeds into the second input of the mixer, the mixer output feeds into the filter bank input, the first output of the filter bank feeds into the second input of the second switch, the second output of the filter bank feeds into the third input of the second switch, the filter bank being operable to select between an upper sideband and a lower sideband, and the second switch output feeds into the programmable divider input.