Abstract
A new low-phase-noise colpitts LC quadrature voltage controlled oscillator (QVCO) is presented. The proposed QVCO is realised by coupling two differential current-switching Colpitts oscillators in an ‘in-phase–anti-phase’ manner. The coupling technique between the two Colpitts LC-voltage controlled oscillators (VCOs) has significantly improved the phase noise of the proposed circuit without using any extra elements. The oscillation frequency of the proposed LC-QVCO is 4 GHz. The Colpitts QVCO exhibits a phase noise of −131.5 and −141.3 dBc/Hz at 1 and 3 MHz offset, respectively. By generalising the coupling scheme to more than two differential Colpitts VCOs in a loop, multiphase signals can be generated.
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