Fig.1 Functional Block Diagram
ASNT6021 SiGe IC combines the functions of transimpedance and limiting amplifiers to convert a small current from a photodiode into a standard digital signal. The device can process an input current signal within the frequency band from DC to 8GHz and deliver output CML signal with a data rate up to 17.6Gbps and differential amplitude of 450mV. The output CML logic interface has on chip 50Ω termination and may be used differentially, AC/DC coupled, single-ended, or in any combination. The part operates from a positive power supply VCC=3.3V. The on-chip peak detector with a sensitivity of 3V/mAgenerates a single-ended output voltage in the range from VCC to VCC-1V.