Self biased dual mode differential CMOS TIA for 400G fiber optic links

A system, the system comprising:

• a semiconductor substrate comprising a plurality of CMOS cells, each of the CMOS cells comprising a deep n-type well region;
• a transimpedance amplifier (TIA) module comprising:
• a first TIA comprising a first input terminal and a first output terminal, the first TIA configured using a plurality of first CMOS cells;
• a second TIA comprising a second input terminal and a second output terminal, the second TIA configured using a plurality of second CMOS cells such that the second input terminal is operable at any positive voltage level with respect to an applied voltage to a deep n-well for each of the plurality of second CMOS cells;
• a photodiode coupled between the first input terminal and the second input terminal, the photodiode being a discrete device and separate from the first and second TIAs;
• a Level Shifting/Differential Amplifier (LS/DA) coupled to the first output terminal and the second output terminal;
• and
• whereupon the first input terminal and the second input terminal are provided with a differential voltage ranging from about 1V to about 5V;
• a Clock and Data Recovery (CDR) module coupled to the TIA module, and configured with a plurality of CMOS cells;
• and
• a communication link.