An 8-32 GHz Frequency Synthesizer based on a Wideband VCO Array with Bandwidth Extension Stage

Conference: GeMiC 2014 - German Microwave Conference
03/10/2014 - 03/12/2014 at Aachen, Germany

Proceedings: ITG-Fb. 246: GeMiC 2014

Pages: 4Language: englishTyp: PDF

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Nehring, J.; Fischer, G.; Weigel, R.; Kissinger, D. (Institute for Electronics Engineering, University of Erlangen-Nuremberg, Cauerstr. 9, 91058 Erlangen, Germany)

This paper proposes a wideband signal source covering a bandwidth of two octaves from 8 GHz to 32 GHz. The system is based on an array of three wideband voltage controlled oscillators (VCOs) for octave wide frequency synthesis and a post-synthesis stage which extends the bandwidth by another octave. The circuits were fabricated in a 0.35micrometer SiGe bipolar technology with an ft/fmax = 170/250 GHz. The VCO tuning ranges are 28.9%, 26.2% and 24.7% respectively. The average output power was measured to be -3.5 dBm. The single-sideband phase noise at 1 MHz offset has an average value of -100 dBc/Hz over the entire bandwidth of two octaves. The system blocks VCO array, bandwidth extension and output buffer consume a power of 175 mW, 277mW and 150 mW.