7,735 research outputs found
- Correlation and Elliptic Flow Parameter of Charmed Mesons at RHIC Energy
We study the correlation between the trigger and the associated
on near and away sides in Au+Au collisions at GeV.
In the region of trigger momentum GeV/, the spectrum is
composed of thermal-shower and shower-shower recombinations in the frame work
of the recombination model. We consider the azimuthal anisotropy in the
quenched hard parton distribution and then calculate the elliptic flow
parameter of charmed mesons (, and ) for different
centralities.Comment: 17 pages, 6 figure
A Novel Three-Point Modulation Technique for Fractional-N Frequency Synthesizer Applications
This paper presents a novel three-point modulation technique for fractional-N frequency synthesizer applications. Convention modulated fractional-N frequency synthesizers suffer from quantization noise, which degrades not only the phase noise performance but also the modulation quality. To solve this problem, this work proposes a three-point modulation technique, which not only cancels the quantization noise, but also markedly boosts the channel switching speed. Measurements reveal that the implemented 2.4 GHz fractional-N frequency synthesizer using three-point modulation can achieve a 2.5 Mbps GFSK data rate with an FSK error rate of only 1.4 %. The phase noise is approximately -98 dBc/Hz at a frequency offset of 100 kHz. The channel switching time is only 1.1 μs with a frequency step of 80 MHz. Comparing with conventional two-point modulation, the proposed three-point modulation greatly improves the FSK error rate, phase noise and channel switching time by about 10 %, 30 dB and 126 μs, respectively
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