Patent ID: 8446302
Filing Date: 2013-05-21
Classification: G04F,H03L

Abstract:
1. A time to digital converter, comprising: a multiphase circuit that generates multiphase signals of which phases are different from each other by 180/M degrees by dividing a differential oscillation signal by M (M is an integral number not smaller than 2); a flip-flop that captures the multiphase signals in synchronization with an input of a reference signal; and a decoder that decodes an output signal of the flip-flop, wherein the multiphase circuit comprises a divide-by-2 circuit that generates the multiphase signals of which phases are different from each other by 90 degrees by dividing the differential oscillation signal by 2, and an interpolation circuit that interpolates an interval between the phases of the multiphase signals at regular intervals by synthesizing a plurality of inverter outputs driven by the multiphase signals of which phases are different from each other.