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Title Inductorless Broadband Transimpedance Amplifier for 25-Gb/s NRZ and 50-Gb/s PAM-4 Operations in a 90-nm CMOS Technology
Authors (Jau-Ji Jou) ; (Tien-Tsorng Shih) ; (Chih-Chen Peng) ; (Hao-Wen Hsu) ; (Xuan-Yi Ye)
Page pp.304-310
ISSN 1598-1657
Keywords Transimpedance amplifier (TIA); optical receiver; high-speed transmission; four-level pulse amplitude modulation (PAM-4); complementary metal-oxide-semiconductor (CMOS)
Abstract In this study, an inductorless broadband transimpedance amplifier (TIA) is implemented using TSMC 90-nm complementary metal-oxide-semiconductor (CMOS) technology. A regulated cascode circuit with low input impedance is used as the input stage of the TIA. The core amplifier is a fully differential amplifier with active feedback. The output stage of the TIA is an equalizer based on a differential amplifier with a source degenerated resistor and capacitor. The TIA has a bandwidth of 24.8 GHz and good linearity. In the TIA chip testing, clear 25-Gb/s nonreturn to zero and 50-Gb/s four-level pulse amplitude modulation eye diagrams can be observed.