Implementing enhanced CMOS inverter based optical transimpedance amplifier

The circuit for implementing an enhanced bias configuration for CMOS inverter based optical Transimpedance Amplifiers (TIAs) comprising:

• a Transimpedance Amplifier (TIA) including a photo-detector, and the TIA being formed by a first TIA inverter and a second TIA inverter;
• said first TIA inverter having an input from a cathode side of said photo-detector and said second TIA inverter with an input from an anode side of said photo-detector;
• a respective output of said first TIA inverter and said second TIA inverter coupled to a respective input of a first operational amplifier and a second operational amplifier;
• and
• said first operational amplifier and said second operational amplifier in a feedback configuration for respectively biasing a set voltage level at said cathode side photo-detector input to said first TIA inverter and at said anode side photo-detector input of said second TIA inverter;
• a replica TIA formed by two replica inverters, a respective output of said respective replica inverters coupled to another respective input of said first operational amplifier and said second operational amplifier.

The circuit for implementing an enhanced bias configuration for CMOS inverter based optical Transimpedance Amplifiers (TIAs) comprising:

• a Transimpedance Amplifier (TIA) including a photo-detector, and the TIA being formed by a first TIA inverter and a second TIA inverter;
• said first TIA inverter having an input from a cathode side of said photo-detector and said second TIA inverter with an input from an anode side of said photo-detector;
• a respective output of said first TIA inverter and said second TIA inverter coupled to a respective input of a first operational amplifier and a second operational amplifier;
• and
• said first operational amplifier and said second operational amplifier in a feedback configuration for respectively biasing a set voltage level at said cathode side photo-detector input to said first TIA inverter and at said anode side photo-detector input of said second TIA inverter
• a replica TIA formed by two replica inverters, a respective low pass filter (LPF) coupled between said respective inputs of said first operational amplifier and said second operational amplifier and said respective outputs of said two replica inverters and said respective output of said first TIA inverter and said second TIA inverter.