LIGHT DETECTION CIRCUIT AND MEASUREMENT DEVICE

To provide a light detection circuit capable of reducing crosstalk caused by one of parasitic capacitance between photodiodes and parasitic capacitance between output wirings.SOLUTION: A light detection circuit 2A comprises PDs 22a(1) and 22a(2) which detect light pulses, circuit elements 27(1) and 27(2), and signal generation circuits 28(1) and 28(2). The circuit elements 27(1) and 27(2) each have capacitance between a one-end side and an other-end side. The circuit elements 27(1) and 27(2) have respective one-end sides electrically connected to respective output ends of the PDs 22a(1) and 22a(2). The signal generation part 28(1) generates an output signal Vout1 corresponding to the difference between a current received through a wire 25(1) and a current received through the circuit element 27(2). The signal generation part 28(2) generates an output signal Vout2 corresponding to the difference between a current received through a wire 25(2) and a current received through the circuit element 27(1).SELECTED DRAWING: Figure 4 【課題】フォトダイオード間の寄生容量及び出力配線間の寄生容量のうち少なくとも一方に起因するクロストークを低減可能な光検出回路を提供する。【解決手段】光検出回路２Ａは、光パルスを検出するＰＤ２２ａ（１）及び２２ａ（２）と、回路要素２７（１）及び２７（２）と、信号生成回路２８（１）及び２８（２）とを備える。回路要素２７（１）及び２７（２）は、一端と他端との間に容量を有する。回路要素２７（１）及び２７（２）の各一端は、ＰＤ２２ａ（１）及び２２ａ（２）の各出力端とそれぞれ電気的に接続されている。信号生成回路２８（１）は、ワイヤ２５（１）を通じて受けた電流と、回路要素２７（２）を通じて受けた電流との差に応じた出力信号Ｖｏｕｔ１を生成する。信号生成回路２８（２）は、ワイヤ２５（２）を通じて受けた電流と、回路要素２７（１）を通じて受けた電流との差に応じた出力信号Ｖｏｕｔ２を生成する。【選択図】図４