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Appl. Sci. 2017, 7(7), 689; doi:10.3390/app7070689

Switched 4-to-1 Transimpedance Combining Amplifier for Receiver Front-End Circuit of Static Unitary Detector-Based LADAR System

1
Department of Electronics Engineering, Chungnam Nation University, Daejeon 34134, Korea
2
Electronics and Telecommunication Research Institute, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Ting-Chung Poon
Received: 3 June 2017 / Revised: 23 June 2017 / Accepted: 30 June 2017 / Published: 4 July 2017
(This article belongs to the Section Optics and Lasers)
View Full-Text   |   Download PDF [4194 KB, uploaded 4 July 2017]   |  

Abstract

Laser detection and ranging (LADAR) systems are commonly used to acquire real-time three-dimensional (3D) images using the time-of-flight of a short laser pulse. A static unitary detector (STUD)-based LADAR system is a simple method for obtaining real-time high-resolution 3D images. In this study, a switched 4-to-1 transimpedance combining amplifier (TCA) is implemented as a receiver front-end readout integrated circuit for the STUD-based LADAR system. The 4-to-1 TCA is fabricated using a standard 0.18 μm complementary metal-oxide-semiconductor (CMOS) technology, and it consists of four independent current buffers, a two-stage signal combiner, a balun, and an output buffer in one single integrated chip. In addition, there is a switch on each input current path to expand the region of interest with multiple photodetectors. The core of the TCA occupies an area of 92 μm × 68 μm, and the die size including I/O pads is 1000 μm × 840 μm. The power consumption of the fabricated chip is 17.8 mW for a supplied voltage of 1.8 V and a transimpedance gain of 67.5 dBΩ. The simulated bandwidth is 353 MHz in the presence of a 1 pF photodiode parasitic capacitance for each photosensitive cell. View Full-Text
Keywords: LADAR; STUD; switched-TCA; optical receiver LADAR; STUD; switched-TCA; optical receiver
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, E.-G.; Lee, J.-E.; Jung, B.C.; Mheen, B.; Kim, C.-Y. Switched 4-to-1 Transimpedance Combining Amplifier for Receiver Front-End Circuit of Static Unitary Detector-Based LADAR System. Appl. Sci. 2017, 7, 689.

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