Performance improvement of real-time 3D imaging ladar based on a modified array receiver

Hirai, Akihito; Kameyama, Shumpei; Imaki, Masaharu; Tsuji, Hiroyuki; Takabayashi, M.; Sasahata, Yoshifumi; Hirano, Y.

doi:10.1117/12.918565

Cited by 2 publications

(1 citation statement)

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“…Moreover, the walk time error caused by limited slew rate and response time with comparator can deteriorate the timing accuracy [1,2,3,4]. For the ADC based LiDAR, it can extract more information, including peak and intensity which is relevant to the material and the rate of surface reflectivity of the target objects, from the digitalized full waveforms [5]. Therefore, with sophisticated extraction algorithm, ADC-based structure can provide much more comprehensive environment awareness.…”

Section: Introductionmentioning

confidence: 99%

A novel TDC/ADC hybrid reconstruction ROIC for LiDAR

Xia

et al. 2019

IEICE Electron. Express

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A novel low complexity TDC/ADC hybrid reconstruction readout circuit (ROIC) is proposed for LiDAR. Compared with other TDC-based receivers, the proposed circuit can provide a higher sampling speed, while consuming less power than ADC-based receivers. The circuit structure is constructed based on a sampler circuit to realize full waveform reconstruction. To further reduce power consumption, a Time Control Technique (TCT) is utilized to enable the sampler circuit to work only when needed. More specifically, the bandwidth, gain and input referred noise current spectral density of analog front-end (AFE) circuit are set as 150 M, 83 dB and 3.25 pA/sqrt (Hz), respectively. The experiment results demonstrate the feasibility that the sampler circuit can reach more than 3 GHz sampling frequency with only 2.8 mW power consumption.

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