This paper presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two p-core Colpitts cross-coupled voltage-controlled oscillators (VCOs) with an LC ring resonator to provide the quadrature outputs. The proposed CMOS QVCO has been implemented with the TSMC 0.18μm CMOS technology and the die area is 0.478×0.82mm2. At the supply voltage of 1.5V, the total power consumpt...

On-chip distributed transmission line resonators in CMOS technology have become the interest of research subjects recently (Ono et al. 2001; Umeda et al., 1994; Kanaya et al., 2006; Wolf, 2006) because of their size which becomes more compact, as the frequency of application increases. Among the various transmission lines, coplanar waveguide (CPW) has more engineering applications (Toyoda, 1996...

Phase locked loop (PLL) is one of the most critical devices in modern electronic systems. PLLs are widely used as clock generator or frequency synthesis in communication systems, computers, radio and other electronic applications. Phase noise represents the phase variations of a PLL output signal and is the most important characteristic of PLLs because it reflects the stability of PLL systems. ...

A divider-less PLL exploits a phase detector that directly samples the VCO with a reference clock. No VCO sampling buffer is used while dummy samplers keep the VCO spur <-56dBc. A modified inverter with low short-circuit current acts as a power efficient reference clock buffer. The 2.2GHz PLL in 0.18μm CMOS achieves -125dBc/Hz in-band phase noise with only 700μW loop-components power. Introduct...