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We present a nonlinear approach based on the perturbation theory to analyze the synchronized oscillations in circuits made up of two coupled LC differential oscillators (LC-VCO), widely used in RF systems to generate quadrature oscillations. Closed-form expressions are derived to predict the amplitude and phase of oscillations and their orbital stability. The capabilities of the method are also briefly...
A fully integrated 40-Gb/s transceiver fabricated in a 0.13-mum CMOS technology is presented. The receiver operates at a 20-GHz clock performing half-rate clock and data recovery. Despite the low fTof 70 GHz, the input sampler achieves 10-mV sensitivity using pulsed latches and inductive-peaking techniques. In order to minimize the feedback latency in the bang-bang controlled CDR loop, the proportional...
A 4 GHz quadrature voltage-controlled oscillator (QVCO) topology is proposed where a planar spiral transformer is used as coupling terminals. Two identical LC oscillators are cross-coupled by the transformer to generate the quadrature outputs. The transformer also serves as filtering network for the oscillators to improve the phase noise performance. The quadrature oscillator based on the proposed...
A phase-noise reduction technique for quadrature VCOs reduces and shapes the transistor thermal noise injected into the system, and also provides a phase-to-amplitude noise conversion mechanism to further reduce phase noise. Two experimental designs provide 17% and 1% tuning ranges centered at 5.1GHz and 5.3GHz with phase noise of -132.6dBc/Hz and -134.4dBc/Hz at a 1MHz offset, respectively
A 32 GHz quadrature VCO achieves over 45 dB of image rejection in a 70 GHz-f/sub T/ SiGe process. Each VCO stage uses a new negative resistance topology to realize >330 /spl Omega/ of negative resistance with <4 fF parasitic capacitance. The coupled VCO has a measured tuning range of 30.6 to 32.6 GHz, phase noise of -97 dBc/Hz at 1 MHz offset and occupies 0.7/spl times/0.5 mm/sup 2/.
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