Class-AB Frequency multiplication using parallel coupled LC quadrature phase oscillator

This paper presents a class-AB based frequency multiplication from parallel LC QVCO shown in a 90nm CMOS process technology. It is suitable for low-Q inductor on-chip CMOS integration. The 4-phase output of QVCO is given to class-AB common source amplifier to generate higher order frequency. At 2.6GHz VCO operating frequency, the frequency multiplier generates 5.2GHz and 10.4GHz sinusoidal signal respectively for multiplier values 2 and 4. The frequency multiplier circuit designed from a 1V supply drawing bias currents of 123 μA and 231 μA for generating second and fourth harmonic of the VCO operating at 2.6GHz.