7.42∼8.52GHz low phase noise VCO with harmonics suppression using capacitance ground

Abstract

This paper presents a low phase noise of the complementary cross-coupled voltage-controlled oscillator, which oscillates at a range of 7.42∼8.52GHz. This VCO utilizes switching capacitor modules in which four channels are able to be selected. Moreover, We makes good use of filtering technique for reduction 1/f noise, and MOS varactors are used as fine tuning. The fully integrated VCO provides excellent performance with high FOM −193 dBc/Hz. The bandwidth of frequency is 1.1GHz and the tuning range is 13.8%. The power dissipation of the core circuit is 8.28mW under 1.8V supply and phase noises all are smaller than −124.3dBc/Hz at 1MHz offset. This VCO was made by TSMC 0.18µm 1P6M CMOS standard process and the chip area is 0.75× 0.69 ( mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ).