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A CMOS quadrature VCO has been designed in a 0.35 mum CMOS process. Using a combination of switched binary-weighted capacitors and standard varactors, this VCO achieves a 59% tuning range with a control voltage ranging from -0.25 to 0.75 V. The phase-noise varies within the tuning range from -131.3 dBc/Hz to -121.2 dBc/Hz at 1 MHz frequency offset. The circuit consumes only 9.37 mW at 2.71 GHz and...
We propose a heuristic for the optimal sizing of LC VCO. The heuristic is an algorithm driven methodology that allows us determining optimal sizes of inductors, bias current and channel widths that minimizes the VCOpsilas phase noise. The proposed optimization methodology was applied to size a cross-coupled differential voltage controlled oscillator. This latter, designed using AMS 0.35 mum technology,...
This paper presents a model of the frequency sensitivity to the control voltage (Kvco) of a ring oscillator. The proposed model is devoted to the PMOS symmetric load Ring oscillator. An example considering a 2.5 V CMOS 65 nm is presented where the accuracy of the results are presented and compared to those obtained using ELDO simulator.
A high-level design approach for single-resistance- controlled-oscillators (SRCOs) is introduced by applying symbolic analysis to derive behavioral models of unity-gain cells, e.g. current and voltage followers. The followers are designed by using standard CMOS technology of 0.35 mum and their behavior is approached by a first-order fully-symbolic expression which is in good agreement to SPICE simulations...
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