A digital phase lock device for seamless switching of SDH product clock board

• Main Authors: YU LI, LU BO, CHEN XINKUN
• Format: Patent
• Language: Chinese; English
• Published: 12.05.2010
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

The invention discloses a digital locked device of digital synchronous serial SDH product clock through seamless conversion, which comprises the following parts: clock source selecting unit, phase demodulator, filter, digifax conversing controller, digital converser, thermostatic voltage-controlled transistor oscillator and frequency divider, wherein the phase demodulator generates pulse to display different phases according to the phase difference selected by local clock and clock source selecting unit, which utilizes multi-phase interval counting clock to count pulse breadth; the counting value is proportional to phase difference; the filter generates OCXO control voltage according to the value of phase demodulator, which makes the phase difference of using and preparing clock not pass the period of equivalent counting clock. The invention has controllable function, which simplifies the project and saves cost.