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A receiver optoelectronic integrated circuit (OEIC) with integrated PIN photodiode, an automatic gain control transimpedance amplifier, linear post amplifier and 50 Â¿ line driver is presented. Two ICs were designed using 0.6 Â¿m BiCMOS technology. One with 760 mV differential output voltage and 623 MHz bandwidth, the other IC has a 420 mV differential output voltage and 712 MHz bandwidth. The post-layout simulation for this optical receiver for multi-level data signals shows a high linearity. The eye diagram of the multi-level signal at a symbol rate of 1.25 Gbaud demonstrates an excellent performance for the optical receiver. The experimental measurement with a binary signal at a bit rate of 1.25 Gb/s indicates that the front-end optical receiver has for 660 nm a sensitivity of -24 dBm for a bit error rate of 10-9. The reached 10%-90% rise- and fall-times are 0.42 ns and 0.40 ns, respectively.