This　paper　proposes　a　low-noise　analog　frontend　circuit　for　optical　receivers,　which　can　tolerate　relatively　large　photodiode　(PD)　parasitic　capacitance　while　ensuring　the　required　bandwidth　and　sensitivity　for　a　given　data　rate.　The　proposed　circuit　includes　a　high-gm　transimpedance　amplifier　(TIA)　with　a　three-stage　class-AB　topology　and　large　feedback　resistance　to　suppress　the　input-referred　noise　so　as　to　improve　the　sensitivity　of　the　receiver,　while　employs　bandwidth　extension　structures　in　the　cascaded　limiting　amplifier　and　output　driver　to　overcome　the　noise-bandwidth　tradeoff.　Designed　in　65-nm　CMOS,　post-layout　simulation　shows　that　the　circuit　achieves　an　optical　modulation　amplitude　(OMA)　sensitivity　of-17.98　dBm　at　10　Gb/s　for　BER=10-12,　and　a　bandwidth　of　7.98　GHz,　under　an　overall　parasitic　input　parasitic　capacitance　of　467　fF.　©　2021　IEEE.