Design and Analysis of a Microwave-Optical Dual Modality Biomolecular Sensing Platform
Design and Analysis of a Microwave-Optical Dual Modality Biomolecular Sensing Platform
复制标题
微波-光学双模态生物分子传感平台的设计与分析
DOI:
10.1109/jssc.2019.2946817
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发表时间:
2020
影响因子:
5.4
通讯作者:
Niknejad, Ali M.
中科院分区:
文献类型:
--
作者:
Zhang, Luya;Niknejad, Ali M.
A combined microwave-optical biomolecular sensor with high sensitivity and selectivity is presented. The microwave sensor characterizes the dielectric properties of a medium using the oscillation frequency shift. To improve the sensor sensitivity beyond the 1/f3phase noise limit, a quadrature-oscillator-based reactance sensing scheme is proposed, which attenuates the 1/f3noise by 20 dB/decade. Further sensitivity enhancement is realized by a novel chopping technique that modulates the free-running frequencies of the coupled oscillators differentially while maintaining a fixed locking frequency. To achieve a higher selectivity, optical sensors are introduced to target specific biomolecules. Utilizing single-photon avalanche diodes, they detect both photon intensity and photon emission time. A biosensor prototype was fabricated in a 28 nm CMOS technology. The microwave sensor achieves 0.2 ppm/√Hz frequency sensitivity with 11.5 mW power consumption. The optical sensor shows 500/s dark count rate and 300 ps timing jitter at 1 V excess bias. A protein thermal denaturation experiment confirms the sensitivity and selectivity enhancement of the dual-modality biosensing platform.
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