An estimated method of urban <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si119.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mstyle mathvariant="normal"><mml:mi>PM</mml:mi></mml:mstyle></mml:mrow><mml:mrow><mml:mn>2.5</mml:mn></mml:mrow></mml:msub></mml:math> concentration distribution for a mobile sensing system

Hu, Yidan; Fan, Jin; Zhang, Hua; Chen, Xinxin; Dai, Guojun

doi:10.1016/j.pmcj.2015.06.004

Cited by 14 publications

(2 citation statements)

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“…Several dangerous health issues such as birth defects, lung cancer, asthma, and premature death are reported as the side-effects of the PM2.5 particles [3][4][5]. Various studies have been done to estimate air pollution in both indoor and outdoor applications [6][7][8][9]. In [6,7], urban fine dust monitoring was proposed.…”

Section: Refers To the Particles In The Airmentioning

confidence: 99%

See 1 more Smart Citation

A 77-dB Dynamic-Range Analog Front-End for Fine-Dust Detection Systems with Dual-Mode Ultra-Low Noise TIA

Rad

Hejazi

Asl

et al. 2021

Sensors

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This paper presents an analog front-end for fine-dust detection systems with a 77-dB-wide dynamic range and a dual-mode ultra-low noise TIA with 142-dBΩ towards the maximum gain. The required high sensitivity of the analog signal conditioning path dictates having a high sensitivity at the front-end while the Input-Referred Noise (IRN) is kept low. Therefore, a TIA with a high sensitivity to detected current bio-signals is provided by a photodiode module. The analog front end is formed by the TIA, a DC-Offset Cancellation (DCOC) circuit, a Single-to-Differential Amplifier (SDA), and two Programmable Gain Amplifiers (PGAs). Gain adjustment is implemented by a coarse-gain-step using selective loads with four different gain values and fine-gain steps by 42 dB dynamic range during 16 fine steps. The settling time of the TIA is compensated using a capacitive compensation which is applied for the last stage. An off-state circuitry is proposed to avoid any off-current leakage. This TIA is designed in a 0.18 µm standard CMOS technology. Post-layout simulations show a high gain operation with a 67 dB dynamic range, input-referred noise, less than 600 fA/√Hz in low frequencies, and less than 27 fA/√Hz at 20 kHz, a minimum detectable current signal of 4 pA, and a 2.71 mW power consumption. After measuring the full path of the analog signal conditioning path, the experimental results of the fabricated chip show a maximum gain of 142 dB for the TIA. The Single-to-Differential Amplifier delivers a differential waveform with a unity gain. The PGA1 and PGA2 show a maximum gain of 6.7 dB and 6.3 dB, respectively. The full-path analog front-end shows a wide dynamic range of up to 77 dB in the measurement results.

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Section: Refers To the Particles In The Airmentioning

confidence: 99%

“…Various studies have been done to estimate air pollution in both indoor and outdoor applications [6][7][8][9]. In [6,7], urban fine dust monitoring was proposed. In [8], an unmanned vehicle was proposed to collect the information.…”

Section: Refers To the Particles In The Airmentioning

confidence: 99%