| 摘要 |
<p>A light-receiving and amplifying device includes a plurality of photodiodes (PDA, PDB, PDC, and PDD) and amplifier circuits (AMPA, AMPB, AMPC, and AMPD) which receive inputs from anodes of the photodiodes (PDA, PDB, PDC, and PDD). There is provided a first current mirror circuit (1) for outputting a second current (I2) having the same magnitude as that of a first current (I1) which is a sum of currents flowing through cathodes of the photodiodes (PDA, PDB, PDC, and PDD). Further provided is a second current mirror circuit (2) which receives the second current (I2) from the first current mirror circuit (1) and receives divided currents (I4, I5, I6, and I7) each having an even magnitude from the anodes of the photodiodes. An AC operation range of the light-receiving and amplifying device is widened in a simple manner at a low cost without significant dimensional increase of the device. <IMAGE></p> |
