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This paper presents the design, analysis, and characterization of a low-power, low-phase-noise, phase-tunable injection-coupled LC quadrature oscillator (PTIC-QVCO). Two LC VCOs are superharmonically coupled in quadrature phase via a frequency doubler that injects a synchronizing signal at the common source node of the negative transconductor stage. Conceptual and analytical models of the circuit...
A superharmonic injection-coupled quadrature oscillator topology (IC-QVCO) for low power low phase noise quadrature signal synthesis is introduced. A tunable tail filter (TTF) reduces the oscillator phase noise and calibrates the residual quadrature error in the presence of a 3-sigma variation in the device parameters. As a proof of concept, a 9 GHz prototype is implemented in a 0.18 mum RF CMOS process,...
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