2018
DOI: 10.3390/s18072200
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CMOS Capacitive Fingerprint Sensor Based on Differential Sensing Circuit with Noise Cancellation

Abstract: In this paper, we introduce a differential sensing technique for CMOS capacitive fingerprint detection. It employs a new capacitive-sensing cell structure with charge sharing detection and readout circuit. The proposed technique also can eliminate the effect of parasitic capacitances by employing parasitic insensitive switched-capacitor structure and so increases the sensitivity even under severe noisy conditions. It can also overcome the performance degradation caused by various conditions of finger surface b… Show more

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Cited by 18 publications
(7 citation statements)
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“…For capacitive scanning, both the conductivity and permittivity of the target (finger or phantom) are critical; conductivity is required for charge to flow during charging and discharging, whereas the permittivity of a material determines how much it is polarized by the electric field of the scanner. , The parasitic capacitance between the scanner and target is also inversely correlated with the distance, which facilitates the differentiation of feature (ridge) heights. The conductivity of EVA-G phantoms is 1.2 ± 0.1 × 10 –3 S/m, and the complex permittivity is 42 ± 4; both are about an order of magnitude lower than that of dry human skin (2.0–2.5 × 10 –2 S/m, and 550–1100 respectively) .…”
Section: Resultsmentioning
confidence: 99%
“…For capacitive scanning, both the conductivity and permittivity of the target (finger or phantom) are critical; conductivity is required for charge to flow during charging and discharging, whereas the permittivity of a material determines how much it is polarized by the electric field of the scanner. , The parasitic capacitance between the scanner and target is also inversely correlated with the distance, which facilitates the differentiation of feature (ridge) heights. The conductivity of EVA-G phantoms is 1.2 ± 0.1 × 10 –3 S/m, and the complex permittivity is 42 ± 4; both are about an order of magnitude lower than that of dry human skin (2.0–2.5 × 10 –2 S/m, and 550–1100 respectively) .…”
Section: Resultsmentioning
confidence: 99%
“…Energy storage bypass circuit ( shown in Fig. 2(a)) was designed with a capacitor of 0.1 μF is connected between the power supply and ground [14] to stabilize the supply voltage and enhance the signal stability by bypassing the AC noise.…”
Section: Signal Processing Circuitmentioning
confidence: 99%
“…The capacitive sensing technique is widely preferred in mobile and Internet of Things (IOT) applications due to the light weight, less power usage, reasonable cost-effectiveness, and convenience of embedding in the present applications [ 56 , 57 , 58 ]. There are several small and low-cost capacitive sensors identified in the literature [ 57 , 59 , 60 , 61 , 62 , 63 , 64 ]. However, most of the existing work experience the issues of finger sensitivity for wet and dry conditions and noisy environment.…”
Section: Sensorsmentioning
confidence: 99%
“…A lot of research has explored integrating the fingerprint sensor in the mobile display and improving the stand-alone fingerprint sensing [ 57 ]. The research team [ 49 , 50 , 51 ] exploited on-display mutual capacitance to produce a prototype with finger-capture feature in mobile devices.…”
Section: Sensorsmentioning
confidence: 99%