CIRCUIT DEVICE, PHOTODETECTOR, OBJECT DETECTION DEVICE, SENSING DEVICE, MOVING BODY DEVICE, SIGNAL DETECTION METHOD, AND OBJECT DETECTION METHOD

PROBLEM TO BE SOLVED: To provide a circuit device that can accurately detect a voltage signal based on an output current from a light receiving element.SOLUTION: A PD output detection part as a circuit device comprises: a waveform processing circuit that generates undershoot in a voltage signal (light receiving signal) based on an output current from a light receiving element (PD 42 for time measurement); and a signal processing circuit 80 that binarizes the voltage signal in which undershoot has been generated with a plurality of thresholds. The plurality of thresholds include a first threshold (threshold 1) larger than a reference level and a second threshold (threshold 2) smaller than the reference level. In this case, a light receiving timing of the PD 42 for time measurement can be accurately detected.SELECTED DRAWING: Figure 8 【課題】 受光素子の出力電流に基づく電圧信号を精度良く検出できる回路装置を提供する。【解決手段】 回路装置としてのＰＤ出力検出部は、受光素子（時間計測用ＰＤ４２）の出力電流に基づく電圧信号（受光信号）にアンダーシュートを発生させる波形処理回路と、アンダーシュートが発生した電圧信号を複数の閾値で二値化する信号処理回路８０と、を備え、複数の閾値は、基準レベルよりも大きい第１の閾値（閾値１）と、基準レベルよりも小さい第２の閾値（閾値２）を含む。この場合には、時間計測用ＰＤ４２での受光タイミングを精度良く検出することができる。【選択図】図８