Tuan Vu, CAO3; Wisland, Dag T.3; Lande, Tor Sverre3; Moradi, Farshad4
1 Department of Engineering - Integrated Electronics, Department of Engineering, Science and Technology, Aarhus University2 Aarhus University School of Engineering - Electronics, Aarhus University School of Engineering, Science and Technology, Aarhus University3 UiO4 Department of Engineering - Integrated Electronics, Department of Engineering, Science and Technology, Aarhus University
The paper introduces a bulk-controlled ring-VCO with a tail transistor utilizing flicker-noise (1/f-noise) reduction techniques for a frequency-based DeltaSigma modulator (FDSM). This VCO converts an analog input voltage to phase information under various bias conditions ranging from sub-threshold to saturation. By using the 1/f-noise reduction circuit which is based on the switched bias technique, the simulations indicate that less noise is transferred to the output when the 1/f-noise reduction circuit is used. The phase noise of the proposed VCO is improved by 7.6% while maintaining tuning-range and linearity compared to conventional VCO. The circuit is designed using a 90 nm CMOS process.
Main Research Area:
nternational Conference "Mixed Design of Integrated Circuits and Systems", 2009