| Title |
Bootstrapped Fully Differential CMOS Transimpedance Amplifier |
| Authors |
박윤지(Yoonji Park) ; 박성민(Sung Min Park) |
| DOI |
https://doi.org/10.5573/ieie.2019.56.6.19 |
| Keywords |
bootstrap ; CMOS ; fully-differential ; mirrored-cascode ; TIA |
| Abstract |
This paper presents a novel bootstrapped fully differential CMOS transimpedance amplifier(BFD-TIA) for the applications of unmanned vehicle LiDAR systems or mid-range image processing systems. The mirrored-cascode input stage consists of a cascode input with a feedback resistor and its mirrored differential stage by connecting the inverting output voltage from the drain node of the common-source transistor to the gate of the mirrored differential stage through an AC-coupling capacitor. Moreover, bootstrapping technique is exploited to reduce the direct effect of the notorious photodiode capacitance upon the bandwidth and noise performance in a typical voltage-mode TIA.. Test chips of the proposed BFD-TIA were implemented by using a 0.13-μm CMOS technology. Measured results demonstrate that the BFD-TIA achieves 86-dBΩ transimpedance gain, 500-Mb/s operation speed(PIN-photodiode modeling: 25 Ω resistance and 0.5 pF capacitance), 7.9-pA/sqrt(Hz) average noise current spectral density, and 24-mW power consumption from a single 1.2-V supply. Chip core occupies the area of 185 × 87 μm2. |