Low-power 10 Gb/s inductorless inverter based common-drain active feedback transimpedance amplifier in 40 nm CMOS

Abstract

This study presents an inductorless 10 Gb/s transimpedance amplifier (TIA) implemented in a 40 nm CMOS technology. The TIA uses an inverter with active common-drain feedback (ICDF-TIA). The TIA is followed by a two-stage differential amplifier and a 50 Ω differential output driver to provide an interface to the measurement setup. The optical receiver shows measured optical sensitivities of ?17.7 and ?16.2 dBm at BER = 10?12 for data rates of 8 and 10 Gb/s, respectively. The TIA has a simulated transimpedance gain of 47 dBΩ, 8 GHz bandwidth with 0.45 pF total input capacitance for the photodiode, ESD protection and input PAD. The TIA occupies 0.0002 mm2 whereas the complete optical receiver occupies a chip area of 0.16 mm2. The power consumption of the TIA is only 2.03 mW and the complete chip dissipates 17 mW for a 1.1 V single supply voltage. The complete optical receiver has a measured transimpedance gain of 57.5 dBΩ.