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Wide-tuning-range voltage-controlled oscillator (VCO) design is motivated by applications in broadband communications, radars, phase-locked loops and clock generation/distribution. In this paper, post-layout simulation results of a ring quadrature VCO (QVCO) combined with an exclusive-OR (XOR) to double the frequency in 130nm SiGe BiCMOS technology are presented. The combined VCO can be tuned from...
This letter presents a new symmetrical tail current-shaping technique to improve the phase noise of a quadrature voltage-controlled oscillator (QVCO). This proposed QVCO consists of two first-harmonic injection-locked oscillators (ILOs) and the outputs are injected back to the gates of the QVCO's tail transistors in order to shape the tail currents. A switching current path is provided between the...
This paper describes a low phase noise low dc power quadrature voltage controlled oscillator (QVCO) with a reflection-type IQ modulator. The QVCO using a standard bulk 0.18-mum CMOS process achieves a low phase noise of -115 dBc/Hz at 1-MHz offset frequency, a figure of merit (FOM) of - 191 dBc/Hz, and a core dc power consumption of 5.8 mW with a supply voltage of 1.8 V. The tuning frequency of the...
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