OPTICAL LIGHT RECEIVING DEVICE AND POWER MONITOR METHOD OF OPTICAL LIGHT RECEIVING DEVICE

To provide an optical light receiving device capable of expanding a dynamic range of a current mirror circuit, and a power monitor method of the optical light receiving device.SOLUTION: An optical light receiving device 6 (a power monitor circuit) comprises: a light reception element converting a li...

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Bibliographische Detailangaben
Hauptverfasser: YAGI YUHI, ANZAI SHIMAKO, ICHINO MORIYASU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide an optical light receiving device capable of expanding a dynamic range of a current mirror circuit, and a power monitor method of the optical light receiving device.SOLUTION: An optical light receiving device 6 (a power monitor circuit) comprises: a light reception element converting a light signal to a current; and a current miller circuit 17 that is provided in a flow pass of the current flowing in the light reception element, has a first transistor 15 and a second transistor 14, and reflects a current Ir flowing in a pass of the first transistor to a miller current Im flowing in the pass of the second transistor pass. The first transistor is provided on the flow pass, one of current terminals is connected directly to a first node N1, and the other current terminal is connected to the light reception element. The second transistor is provided on the flow pass in which the miller current flows, and a control terminal is connected to the control terminal of the first transistor, and one current terminal is connected to the first node via a resistance.SELECTED DRAWING: Figure 2 【課題】カレントミラー回路のダイナミックレンジを拡大することができる光受信装置および光受信装置のパワーモニタ方法を提供する。【解決手段】光受信装置6(パワーモニタ回路)は、光信号を電流に変換する受光素子と、受光素子を流れる電流の流路に設けられ、第1のトランジスタ15及び第2のトランジスタ14を有し、第1のトランジスタの経路に流れる電流Irを第2のトランジスタの経路に流れるミラー電流Imに反映させるカレントミラー回路17を備える。第1のトランジスタは、流路上に設けられ、一方の電流端子が直接第1のノードN1に接続され、他方の電流端子が受光素子に接続される。第2のトランジスタは、ミラー電流が流れる流路上に設けられ、制御端子が第1のトランジスタの制御端子と接続され、一方の電流端子が抵抗を介して第1のノードに接続される。【選択図】図2