Concept of wide tuning QVCO adapted for multi-standards applications

This paper presents a quadrature voltage controlled oscillator (QVCO) based on the electric coupling of two identical LC voltage controlled oscillator in 0.35μm CMOS technology. The proposed design of QVCO accomplishes extensive tuning by using binary weighted switched varactor in addition to a linearly varying varactor. The simulated results show the multi-band frequency of proposed QVCO using in multi-standard wireless applications. This structure presents a 50% of tuning range carrier frequency at a range of 2.3 to 3.8 GHz. The phase noise is −130dBc/Hz at 1MHz offset frequency from carrier frequency of 3.5GHz. The power consumption of QVCO is 13.6mW.