Method and system for a feedback transimpedance amplifier with sub-40khz low-frequency cutoff

Abstract

A system for a feedback transimpedance amplifier with sub-40 khz low-frequency cutoff is disclosed and may include amplifying electrical signals received via coupling capacitors utilizing a transimpedance amplifier (TIA) having feedback paths comprising source followers and feedback resistors. Gate terminals of the source followers may be coupled to output terminals of the TIA. The feedback paths may be coupled prior to the coupling capacitors at inputs of the TIA. Voltages may be level shifted prior to the coupling capacitors to ensure stable bias conditions for the TIA. The TIA may be integrated in a CMOS photonics chip and the source followers may comprise CMOS transistors. The TIA may receive current-mode logic or voltage signals. The electrical signals may be received from a photodetector, which may comprise a silicon germanium photodiode differentially coupled to the TIA. Optical signals for the photodetector in the CMOS photonics chip may be received via optical fibers.

Dependencies are inferred from the claim text.