A 0.35 μm CMOS divide-by-2 quadrature injection-locked frequency divider based on voltage–current feedback topology

This paper presents a new divide-by-2 quadrature injection-locked frequency divider (QILFD). The QILFD consists of a new transformer-coupled quadrature voltage controlled oscillator (QVCO) with the voltage–current feedback technique and two NMOS switches, which are in parallel with the QVCO resonators for signal injection. The proposed CMOS QILFD has been implemented with the TSMC 0.35 μm CMOS technology and the core power consumption is 16.52 mW at the supply voltage of 2.2 V. The free-running frequency of the QILFD is tunable from 2.85 GHz to 3.07 GHz. At the input power of 0 dBm, the divide-by-2 operation range is from 5.48 GHz to 6.48 GHz. The phase deviation of free running quadrature output is about 0.53°.