Jun-De Jin

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Nuclear magnetic resonance imaging (MRI) is a powerful tool for non-invasive 3D imaging. Since the precession frequency of a nucleus is linearly proportional to the local magnetic field, a constant spatial gradient field generated by a gradient coil encodes the location of a signal. The imaging is achieved by spatially coding the precession(More)
—A fully integrated frequency divider with an operation frequency up to 20 GHz is designed in 0.18-m CMOS technology. The frequency divider includes two stages to divide the input signal by a factor of 4. A wide locking range from 18.8 to 23.2 GHz was obtained with a low phase noise of 134 8 dBc/Hz (1-MHz offset) at an output frequency of 4.7 GHz. The first(More)
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