Disclosed is an equalizing and amplifying circuit in an optical signal receiving apparatus comprising a preamplifier circuit having an input terminal connected to the output of a light receiving element. The preamplifier circuit amplifies the electrical signal from the light receiving element and outputs...http://www.google.com.tw/patents/US5113151?utm_source=gb-gplus-share專利 US5113151 - Equalizing and amplifying circuit in an optical signal receiving apparatus
