Trans-impedance amplifier for high speed optical-electrical interfaces

A differential trans-impedance amplifier circuit comprising:

• an amplifier having a pair of input nodes and configured to generate an amplified replica of a differential voltage on said pair of input nodes;
• a photodiode;
• a pair of DC-blocking capacitors coupling said photodiode to said pair of input nodes;
• at least one trans-resistance coupled between said pair of input nodes of said amplifier;
• and
• a bias network comprising two identical photodiode biasing resistances each greater than said at least one trans-resistance, each photodiode biasing resistance coupled in series between said photodiode and a respective DC voltage.

An electronic device comprising:

• an amplifier having a pair of input nodes and configured to generate an amplified replica of a voltage on said pair of input nodes;
• a photodiode;
• a pair of DC-blocking capacitors coupling said photodiode to said pair of input nodes;
• at least one trans-resistance coupled between said pair of input nodes of said amplifier;
• and
• a bias network comprising two photodiode biasing resistances each greater than said at least one trans-resistance, each photodiode biasing resistance coupled in series between said photodiode and a respective voltage.