Amplifier for burst signal and optical receiving circuit

摘要

The present invention provides an amplifier capable of accurately reproducing a signal under various operating environments and an optical receiving circuit using the amplifier. The differential amplifier is constructed such that the amplification factor thereof is set to 0.5, and a variation occurring inside thereof is the same as a variation occurring inside of the differential amplifier. Respective output variations occurring in maximum value holding circuits due to a temperature variation and a power supply voltage variation are canceled by providing differential amplification in the differential amplifier. At this time, an output variation occurring in the differential amplifier is also canceled. Therefore, an output variation occurring in the differential amplifier is made equal in value to the output variation occurring in the differential amplifier, such that the same variation as a signal input is superimposed on the reference input fed to the differential amplifier. consequently, a reference input accurately following the DC level of the signal input can be fed to the differential amplifier, whereby stable amplification can always be provided.