A design approach for integrated CMOS LC-tank oscillators using bifurcation analysis

A Time-Variant Analysis of the 1=f Phase Noise in CMOS Parallel LC-Tank Quadrature Oscillators

This paper presents a study of 1 2 phase noise in quadrature oscillators built by connecting two differential LC-tank oscillators in a parallel fashion. The analysis clearly demonstrates the necessity of adopting a time-variant theory of phase noise, where a more simplistic, time-invariant approach fails to explain numerical simulation results even at the qualitative level. Two topologies of 5-...

Design Issues in CMOS Differential LC Oscillators

An analysis of phase noise in differential crosscoupled inductance–capacitance (LC) oscillators is presented. The effect of tail current and tank power dissipation on the voltage amplitude is shown. Various noise sources in the complementary cross-coupled pair are identified, and their effect on phase noise is analyzed. The predictions are in good agreement with measurements over a large range ...

LC-tank CMOS Voltage-Controlled Oscillators using High Quality Inductors Embedded in Advanced Packaging Technologies

Large-Signal Analysis of MOS Varactors in CMOS Gm LC VCOs

MOS varactors are used extensively as tunable elements in the tank circuits of RF voltage-controlled oscillators (VCOs) based on submicrometer CMOS technologies. MOS varactor topologies include conventional D=S=B connected, inversion-mode (I-MOS), and accumulation-mode (A-MOS) structures. When incorporated into the VCO tank circuit, the large-signal swing of the VCO output oscillation modulates...

More on the 1=f Phase Noise Performance of CMOS Differential-Pair LC-Tank Oscillators

This paper presents a rigorous phase noise analysis in the 1 f region for the differential CMOS LC-tank oscillator with both nMOS and pMOS switch pairs. A compact, closed-form phase noise equation is obtained, accounting for the noise contributions from both tank losses and transistors currents, which allows a robust comparison between LC oscillators built with either one or two switch pairs. T...