| 摘要 |
<p>A phase locked loop (200), which does not require a local reference clock to obtain a frequency lock. The circuit (200) includes a frequency locked loop (316) and a phase locked loop (318) in which the frequency locked loop (316) does not require a local reference clock. The frequency locked loop (316) includes a transition counter (302) having an input for data with an output connected to a charge pump (304). This charge pump (304) is connected to a loop filter (306), which in turn is connected to a voltage controlled oscillator (308). The output of the voltage controlled oscillator (308) is connected to a second input in the transition counter (302). The phase locked loop (200) includes a phase detector (310) with an input for data. The output of this phase detector (310) is connected to a second charge pump (312), which has it output connected to the loop filter (306). The output of the voltage controlled oscillator (308) also is connected to the input of the phase detector (310).</p> |
