PHASE DETECTOR CIRCUIT

摘要

A phase comparator circuit that compares the phases of random NRZ signals in a phase synchronizing circuit without losing greatly the synchronism when the same-sign data is inputted and has a phase conversion characteristic of high linearity when the phases are brought in synchronism. The function of preventing the phase synchronizing circuit from greatly losing synchronism i s realized by using a phase comparator circuit of a circuit structure as shown by equations (1), (2), for example, a phase comparator circuit having the structure shown in Figure 11. Since the duty ratio of the pulse appearing at the output terminal (3) of a multiplier circuit (62) approaches 50% as the phases approach their synchronized state, the phase conversion characteristi c does not distort, thereby realizing high linearity of the phase conversion characteristic when the phases are in synchronism.