2021
DOI: 10.3390/s21196360
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A 77-dB Dynamic-Range Analog Front-End for Fine-Dust Detection Systems with Dual-Mode Ultra-Low Noise TIA

Abstract: 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 C… Show more

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Cited by 3 publications
(4 citation statements)
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References 12 publications
(17 reference statements)
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“…Several high-performance current measurement circuit topologies are discussed in [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. One of the common architectures for low current measurements is based on an integrator followed by a differentiator [34][35][36].…”
Section: Design Of Readout Circuitmentioning
confidence: 99%
See 1 more Smart Citation
“…Several high-performance current measurement circuit topologies are discussed in [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. One of the common architectures for low current measurements is based on an integrator followed by a differentiator [34][35][36].…”
Section: Design Of Readout Circuitmentioning
confidence: 99%
“…Furthermore, it is accompanied by a significant temperature sensitivity and nonlinearity that are difficult to address without the use of an additional temperature compensation circuit. Few other current measurement circuits rely on capacitive TIA (C-TIA) to perform current-to-frequency (I-F) conversion [33]; timed integrators with a switched capacitor network or correlated double sampler [37][38][39][40][41]; variable gain amplifiers with external voltage control or digital gain control [26,31,32]; and use of large feedback resistor realized as an on-chip active pseudo resistor or off-chip external resistor. In the case where a pseudo resistor is realized using a transistor, the resistance is inversely proportional to the input current, which leads to a variable current gain and bandwidth that is undesirable.…”
Section: Design Of Readout Circuitmentioning
confidence: 99%
“…Reference voltage generators are required to stabilize the overall PVT variation, and also need to be implemented without modifying the fabrication process [ 21 , 22 , 23 ]. The bandgap reference voltage generator (BGR) is a popular reference voltage generator that successfully achieves the requirements [ 24 , 25 ]. Low power and low voltage operation are the characteristics of reference voltage generators.…”
Section: Circuit Implementationmentioning
confidence: 99%
“…The required VCM of 2.5 V (VDD/2) is provided by VCM Gen. To digitalize the input analog BPSK signal through the proposed DBPSK demodulator, the amplified input analog signal and its invert are required. The STOD circuit converts the single input analog signal to the required differential signal [ 9 ]. Through the SPI, a graphic user interface (GUI) programmer on a computer controls the RX’s digital controller.…”
Section: Overall Architecture and Building Blocksmentioning
confidence: 99%