Design and Analysis of A Low Power QVCO with Capacitive-Coupling Technique

Abstract

Phase noise and phase accuracy are two essential specifications for quadrature signal generation since the two aspects directly affect the quality of the received or transmitted signal in a wireless communication system. The ever-growing demand for chip-level integration of multiband transceiver continues imposing tighter phase noise performance specifications for radio-frequency (RF) carrier generation. Quadrature signals with phase accuracy and no phase ambiguity are critical for image-rejection transceivers since they directly affect the polarity and the outcome of the complex mixers. Phase error existed in the quadrature signals will add to the error of a baseband signal and deteriorate the bit error rate (BER) of a communication system. Thus, a high performance quadrature signal generation technique with both low noise and decent phase accuracy is highly desirable for complex signal modulation and demodulation.