Circuit and method for switching gains of preampli

专利名称：Circuit and method for switching gains of

preamplifier

发明人：Masamichi Nogami,Kuniaki Motoshima申请号：US10477945申请日：20031118

公开号：US20040145419A1公开日：20040729

专利附图：

摘要：A pre-amplifier () amplifies an output current of a photodetector () thatconverts a burst optical signal into an electrical signal, and outputs an electric voltagesignal. A gain switching circuit () is connected with a serial circuit comprising a resistor ()

and a switch () and a serial circuit comprising a resistor () and a switch (), in parallel with afeedback resistor (). The gain switching circuit () includes an arrangement to receive theelectric voltage signal output from the pre-amplifier (), close the switch () at a specific bitposition, close the switch () at the other specific bit position, upon occurrence of asituation that the switch () is to be closed, provided that the switch () is closed.

申请人：NOGAMI MASAMICHI,MOTOSHIMA KUNIAKI

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