Patent ID: 8144813

Claim:
A receiving method, which adjusts a level of an output voltage signal by switching a gain to be used for converting an inputted current signal to a voltage signal in a preamplifier, and which performs offset compensation on the output voltage signal in an offset compensator in a post amplifier, the receiving method comprising the steps of: in the preamplifier: detecting a level variation of the output voltage signal, and generating a first reset signal in response to the detected level variation; adding the first reset signal, whose polarity is made opposite to a polarity of the output voltage signal, to the output voltage signal to generate a preamplifier output voltage signal; and in the post amplifier: providing the preamplifier output voltage signal to the offset compensator; extracting, by a reset signal detector, the first reset signal with polarity opposite the polarity of the output voltage signal from the preamplifier output voltage signal and producing a second reset signal; and resetting the offset compensator by use of the second reset signal.