Patent ID: 6888379

Claim:
A phase detector circuit that receives a random NRZ signal Vi(t) having a period of T and a signal Vi(tâˆ’Î¸T/2Ï€) having the same period and pattern as those of the signal Vi(t) and delayed from the signal Vi(t) by Î¸ in phase, and outputs a signal including a DC voltage component associated with a phase difference Î¸ between said two signals, wherein an output Vo(t) of the phase detector circuit is represented by: Vo ( t )=( Vi ( t )âˆ’ Vi ( tâˆ’T ))Ã— Vi ( tâˆ’Î¸T/ 2Ï€), where the signal Vi(tâˆ’T) is delayed from the signal Vi(t) by the period T of the signal Vi(t).