A New Capacitance-to-Frequency Converter for On-Chip Capacitance Measurement and Calibration in CMOS Technology

Zhu, Dongdi; Mo, Jianchu; Xu, Shiyi; Shang, Yang; Wang, Zhiyu; Huang, Zhengliang; Yu, F. Richard

doi:10.1007/s10836-016-5584-2

Cited by 3 publications

(3 citation statements)

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“…In [ 66 ], a capacitive sensor is proposed, utilizing a combination of CBCM method and capacitance-to-frequency conversion, as illustrated in Figure 6 . In this circuit, the sharp exponential currents of each branch of the CBCM block are averaged using a large integrating capacitor ( C int ) in the analog domain, and then this voltage is converted to frequency by a comparator.…”

Section: Related Workmentioning

confidence: 99%

“… A core-CBCM capacitance-to-frequency converter that integrates all of the exponential CBCM currents in the analog domain and converts them to two frequencies (adapted from [ 66 ]). …”

Section: Figurementioning

confidence: 99%

“…We believe our proposed solution advances previous core-CBCM methods by increasing its IDR. Additionally, in comparison to previous core-CBCM capacitance-to-frequency converters [ 66 , 67 ], digitization of the exponential CBCM current to very small units, and piecewise integration of this current helps to achieve a better resolution, and it is no longer necessary to use very large integrating capacitors to obtain high accuracy. Furthermore, digital outputs of capacitive sensors make reading them much easier, especially if they need to be able to connect to a microcontroller.…”

Section: Introductionmentioning

confidence: 99%

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Toward High Throughput Core-CBCM CMOS Capacitive Sensors for Life Science Applications: A Novel Current-Mode for High Dynamic Range Circuitry

Forouhi

Dehghani

Ghafar-Zadeh

2018

Sensors

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This paper proposes a novel charge-based Complementary Metal Oxide Semiconductor (CMOS) capacitive sensor for life science applications. Charge-based capacitance measurement (CBCM) has significantly attracted the attention of researchers for the design and implementation of high-precision CMOS capacitive biosensors. A conventional core-CBCM capacitive sensor consists of a capacitance-to-voltage converter (CVC), followed by a voltage-to-digital converter. In spite of their high accuracy and low complexity, their input dynamic range (IDR) limits the advantages of core-CBCM capacitive sensors for most biological applications, including cellular monitoring. In this paper, after a brief review of core-CBCM capacitive sensors, we address this challenge by proposing a new current-mode core-CBCM design. In this design, we combine CBCM and current-controlled oscillator (CCO) structures to improve the IDR of the capacitive readout circuit. Using a 0.18 μm CMOS process, we demonstrate and discuss the Cadence simulation results to demonstrate the high performance of the proposed circuitry. Based on these results, the proposed circuit offers an IDR ranging from 873 aF to 70 fF with a resolution of about 10 aF. This CMOS capacitive sensor with such a wide IDR can be employed for monitoring cellular and molecular activities that are suitable for biological research and clinical purposes.

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Section: Related Workmentioning

confidence: 99%

“… A core-CBCM capacitance-to-frequency converter that integrates all of the exponential CBCM currents in the analog domain and converts them to two frequencies (adapted from [ 66 ]). …”

Section: Figurementioning

confidence: 99%