PROJECT TITLE :
V-band low phase noise QVCO in 90nm CMOS technology using a gate-connected tank
A quadrature voltage controlled oscillator (QVCO) with -111 dBc/Hz average phase noise at 1MHz offset across an output frequency vary of forty eight.9-50.3-GHz is presented. The design employs a modification of the Armstrong technique of employing a transformer in the LC tank to improve the section noise by reducing the single-ended component of the tank capacitance in a very differential cross-coupled design and by separating the gate and drain transistor bias. Tuning is achieved by an accumulation MOS varactor and a thermometer-coded bank of fourteen switched capacitors. The look consumes twenty three-mA from a 1.three V supply and occupies an space of zero.twenty five-mm2 in 90 nm CMOS technology.
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