| 摘要 |
<p>The present invention relates to a kind of inject synchronous narrowband phase locked loop (ISNRPLL) circuit, including a synchronous oscillating circuit composed by the connecting of an inject synchronous narrowband reproducible voltage controlled oscillator (ISNRVCO) and an exclusive OR frequeny doubling circuit, a phase locked loop circuit composed by the connection of digital phase discriminators, charge pumps and loop filters, and D triggers used for outputting data. The ISNRVCO circuit does not ask much of the syntonic loop, and can be implemented by integrating an inductance on chips. Preferably, it can be integrated completely by using the deep sub-micron digital CMOS techniques and has little external components. Based on the result of system simulation, the ISNRVCO circuit has a great improvement on the performances such as capture range, capture time and phase yawp compared with the general phase locked loop construct. With its great advantages, it can be used as GHz level fast clock recovery integrate circuit.</p> |
