Open Access3 GHz, 1 mW inverter‐based TIA with capacitive feedback for enhanced gain and sensitivity in VLC applications
Author(s) -
Li Xianbo,
Patrick Yue C.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2018.8025
Subject(s) - capacitive sensing , capacitance , inverter , sensitivity (control systems) , amplifier , bandwidth (computing) , electrical engineering , cmos , electronic engineering , electrical impedance , noise figure , output impedance , materials science , computer science , engineering , physics , telecommunications , voltage , electrode , quantum mechanics
In this Letter, a novel inverter‐based trans‐impedance amplifier (TIA) with enhanced gain and sensitivity is presented for Gb/s visible light communication (VLC). By employing capacitive feedback with a large negative equivalent capacitance to reduce the TIA input capacitance, the proposed TIA achieves a trans‐impedance gain of 89.4 dBΩ with 5.7 dB improvement and an input referred noise current of 0.43 µA rms with 1.8 dB improvement when compared to a reference TIA without capacitive feedback. Both the proposed TIA and the reference TIA have the same −3 dB bandwidth (BW) of 3 GHz and the same power consumption of 1 mW, and they are designed with a 40 nm CMOS process.