Impedance matched CMOS transimpedance amplifier for high-speed fiber optic communications

A fiber optic receiver comprising:

• a detector wherein said detector detects optical energy from an optical fiber and produces an output representative of the detected optical energy;
• and
• a transimpedance amplifier, wherein said transimpedance amplifier comprises:
• an input stage, wherein said input stage receives said output and wherein said input stage has an input impedance;
• a second stage operably coupled to said input stage and having an output impedance;
• and
• bias generating means operably coupled to said input stage and said second stage, wherein said bias generating means biases said input stage and said second stage such that said input impedance substantially matches said output impedance.

A transimpedance amplifier for use in a fiber optic receiver, said transimpedance amplifier comprising:

• an input stage including a first transistor and a second transistor operably coupled to said first transistor, wherein said input stage has an input impedance defined by a transconductance of said first transistor;
• a second stage operably coupled to said input stage, said second stage including a third transistor and a fourth transistor operably coupled to said third transistor, wherein said second stage has an output impedance defined by a transconductance of said third transistor;
• and
• a bias generator operably coupled to said input stage and said second stage, wherein said bias generator biases said input stage and said second stage to substantially fix said input impedance and said output impedance to a same desired value.