Tdc apparatus, distance measuring apparatus, and distance measuring method

Abstract

A TDC apparatus includes a TDC circuit having a delay circuit including a plurality of stages of delay elements that sequentially delay a measurement signal, and a plurality of storage elements configured to respectively hold outputs of the plurality of stages of delay elements in response to a measurement clock input thereto, an edge detection unit configured to detect a detection stage of a delay element, among the plurality of stages of delay elements, that detects at least a rising edge of the measurement signal, based on switching of outputs of the plurality of storage elements, a time calculation unit configured to output a delay time of the measurement signal, and a delay unit configured to delay the measurement signal input thereto and input the delayed measurement signal to the delay circuit of the TDC circuit.