Compact dual‐band bandpass filter using octagonal split‐ring resonators with side‐coupled stubs

Abstract

reported VCO articles [6][7][8][9][10], allows to conclude that the circuit presented achieves the widest tuning range, covering the range from 5.97 GHz to 7.3 GHz corresponding to 20.1% and the best FOM of À183.6 while attaining comparable performance in phase noise, power consumption and chip area. CONCLUSIONSA wider tuning range of 1.5V CMOS transformer-based LC VCO was proposed and successfully implemented in the 0.18 lm 1P6M CMOS technology. The LC tank using a decoupling transformer with two tunable varactors greatly extends the tuning range from 5.97 GHz to 7.3 GHz and achieves good performances in what concerns low supply voltage of 1.5 V, low phase noise of À110.9 dBc/Hz at 1 MHz offset, small chip area of 0.69 Â 0.696 mm 2 , low power consumption of 9.51 mW and a better FOM of À183.6 dB. ACKNOWLEDGMENTSThe authors would like to acknowledge Professor Ron-Yi Liu for layout guidance and the fabrication support and chip fabrication provided by National Chip Implementation Center (CIC). A quadrature CMOS VCO using transformer coupling and current reuse topology, IEICE Trans Commun E90-B (2008), 346-348. 4. H.H. Hsieh and L.H. Lu, A high-performance CMOS voltage-controlled oscillator for ultra-low-voltage operations, IEEE Trans Microwave Theory Tech 55 (2007), 467-473. 5.