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An Integrated 0.6–4.6 GHz, 5–7 GHz, 10–14 GHz, and 20–28 GHz Frequency Synthesizer for Software-Defined Radio Applications

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3 Author(s)
Osmany, S.A. ; IHP, Frankfurt (Oder), Germany ; Herzel, F. ; Scheytt, J.C.

We present an integrated frequency synthesizer which is able to provide in-phase/quadrature phase signal over the frequency bands 0.6-4.6 GHz, 5-7 GHz, 10-14 GHz, and in-phase signal over 20-28 GHz for software-defined radio applications. An integrated voltage-controlled oscillator (VCO) with 34% tuning range and a set of high-speed dividers are used to accomplish all the frequencies. To achieve a wide tuning range while keeping a low gain and a low phase noise, the VCO employs digitally controlled sub-bands. The measured PLL phase noise is - 108 dBc/Hz, -121 dBc/Hz, and -135 dBc/Hz at 1 MHz offset for 24 GHz, 4 GHz, and 700 MHz, respectively. Fabricated in a 0.25 μm SiGe BiCMOS process, the synthesizer occupies a chip area of 4.8 mm2. The synthesizer was optimized for reconfigurable base station applications, but can also be used for cognitive radio, radar systems, satellite communication, and high-speed digital clock generation.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:45 ,  Issue: 9 )

Date of Publication:

Sept. 2010

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