| 摘要 |
<p>A distributed wireless phase locked loop system for synchronizing the transmit carrier's modulating waveform, such as the transmitter pulse timing in a pulsed EAS (electronic article surveillance) system and the transit sweeping function for swept RF synchronization, is provided. To remove the effect of phase noise on the power line signal, a phase locked loop (1) is used to filter this signal. The filtered output is used as a reference to a second phase locked loop (10) tied to a numerically controlled oscillator (8) and the received signal to provide a distributed phase looked loop algorithm that is wireless, and automatically synchronizes adjacent EAS systems.</p> |
