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We present the design and implementation of a 90 -Gb/s non-return-to-zero (NRZ) direct detection optical receiver that consists of a low-noise transimpedance amplifier (TIA), fabricated in a 55-nm SiGe BiCMOS technology, and a Ge photodiode integrated into a Silicon Photonic integrated circuit. Low-noise broadband operation is achieved using a fully differential TIA that provides the photodiode reverse bias. 50-, 56-, and 64-Gb/s NRZ operation is demonstrated at bit-error ratios (BERs) below 10-12 at sensitivities of -12.3-, -11.2-, and -11.1-dBm optical modulation amplitude (OMA) while consuming 128, 141, and 157 mW, respectively. Furthermore, a BER below 10 ^-12 is achieved at 80 Gb/s with a sensitivity of -6.1 dBm (OMA) at 165 mW, and operation below KP4-FEC (2.4 × 10 ^-4 ) is demonstrated up to 90 Gb/s with a sensitivity of -7.1 dBm (OMA) while consuming 222 mW. All BERs were measured in real time …