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.
Highlights
Laser detection and ranging (LADAR) systems are commonly used to acquire real-time three-dimensional (3D) images using the time-of-flight (TOF) of a short laser pulse
In this study, integrated we propose a switched
transimpedance combining amplifier (TCA) has on each front-end readout circuit (ROIC)4-to-1 for the receiver withaaswitch photodetector, In this study, we propose a switched 4-to-1 TCA
Summary
Laser detection and ranging (LADAR) systems are commonly used to acquire real-time three-dimensional (3D) images using the time-of-flight (TOF) of a short laser pulse. In the STUD-based LADAR system, the transmitter emits laser pulses over the entire ROI with two high-speed optical scanners and the receiver detects the returned optical pulses to a static-unitary large-area photodetector. LADAR receiver has multiple partitioned photosensitive cells, as shown problem, problem, the theSTUD-based. To implement a STUD-based LADAR receiver, the same number of TIAs as partitioned cells is needed,cells andis they are and assembled onassembled a single board. To resolve this problem, combining a 4-to-1 transimpedance combining amplifier (TCA) To resolve this problem, a 4-to-1 transimpedance combining amplifier (TCA) was proposed in our previous work [14] as the front-end readout integrated circuit (ROIC) for the STUD-based LADAR receiver with a photodetector, which has four photosensitive partitioned cells. × 100 μm capacitance of the photosensitive area of the photodetector in order to enlarge the ROI in the STUD-based LADAR receiver.
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