Patent ID: 8981853
Filing Date: 2015-03-17
Classification: H03F

Abstract:
1. A differential trans-impedance amplifier circuit comprising: a positive voltage bias node and a negative voltage bias node; a photodiode comprising an anode and a cathode; a pair of identical series impedances coupling said anode to said negative voltage bias node and coupling said cathode to said positive voltage bias node respectively; a pair of load impedances; a pair of output nodes; a first differential input transistor pair, comprising a first pair of input nodes coupled to said anode and cathode respectively, and coupled to said pair of load impedances to generate on said pair of output nodes a first amplified replica of a differential voltage on said first pair of input nodes; a second differential input transistor pair being identical to said first differential input transistor pair, said second differential input transistor pair a pair of blocking capacitors coupling said second pair of input nodes to said positive voltage bias node and said negative voltage bias node respectively.