Amplifying circuit, photoelectric signal detection circuit, detection chip circuit and chip

The invention discloses an amplifying circuit, a photoelectric signal detection circuit, a detection chip circuit and a chip. An adjustable RC circuit network is adopted to obtain the amplifying circuit, a transimpedance resistor converts a photocurrent signal into a voltage signal, the voltage signal is amplified by the variable gain amplifying circuit and then is subjected to secondary detectionby the envelope detection circuit, when an optical signal is relatively strong, envelope output of primary detection can be adopted, and when the optical signal is relatively weak, the envelope output of secondary detection is amplified again in the detection circuit, and the envelope output of secondary detection can be adopted. Through amplification of the variable gain amplifying circuit, band-pass filtering and variable gain are realized, and the size of an external optical signal is judged according to the amplitude of secondary detection. Different gains are achieved by adjusting the numerical value through RC,