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InP/InGaAs DHBT parallel feedback amplifier with 14-dB gain and 91-GHz bandwidth

We have developed a parallel feedback amplifier using our state-of-the-art InP/InGaAs double heterojunction bipolar transistor (DHBT) IC technology. The gain and bandwidth of the amplifier are 14 dB and 91 GHz, respectively, which are large enough for use in 100-Gbit/s applications. Input and output return characteristics at 70 GHz are less than -9 and -11 dB, respectively. Isolation is better than -33 dB below 100 GHz. We also observed an output eye diagram for 100-Gbit/s electrical signal input. Good eye openings were obtained. To the best of our knowledge, the bandwidth is the highest value to date for baseband parallel feedback amplifiers, and this work is the first demonstration of an electrical amplifier for 100-Gbit/s data signals.