On-Chip Implementable Autocalibration of Sensor Offset for Differential Capacitive Sensor Interfaces

2021 ◽  
Vol 70 ◽  
pp. 1-9
Author(s):  
Rakesh Tirupathi ◽  
Sougata Kumar Kar
Keyword(s):  
Capacitive Sensor ◽  
On Chip ◽  
Sensor Interfaces

(Invited) On-Chip Characterization of Microcapsules Using a Capacitive Sensor for Microencapsulation and Single-Cell Analysis Applications

2021 ◽  
Vol MA2021-01 (60) ◽  
pp. 1603-1603
Author(s):  
Sajjad Janfaza ◽  
Seyedehhamideh Razavi ◽  
Arash Dalili ◽  
Mina Hoorfar
Keyword(s):  
Single Cell ◽  
Single Cell Analysis ◽  
Capacitive Sensor ◽  
Cell Analysis ◽  
On Chip

Multichannel 65 zF rms Resolution CMOS Monolithic Capacitive Sensor for Counting Single Micrometer-Sized Airborne Particles on Chip

2016 ◽  
Vol 51 (11) ◽  
pp. 2545-2553 ◽  
Author(s):  
Pietro Ciccarella ◽  
Marco Carminati ◽  
Marco Sampietro ◽  
Giorgio Ferrari
Keyword(s):  
Capacitive Sensor ◽  
Airborne Particles ◽  
On Chip

Bacteria growth monitoring through an on-chip capacitive sensor

2008 ◽  
Author(s):  
Ebrahim Ghafar-Zadeh ◽  
Mohamad Sawan ◽  
Arghavan Shabani ◽  
Mohammed Zourob ◽  
Vamsy Chodavarapu
Keyword(s):  
Capacitive Sensor ◽  
Growth Monitoring ◽  
Bacteria Growth ◽  
On Chip

Wide Input Range Supply Voltage Tolerant Capacitive Sensor Readout Using On-Chip Solar Cell

2015 ◽  
Vol 25 (01) ◽  
pp. 1640006
Author(s):  
Suyan Fan ◽  
Man-Kay Law ◽  
Mingzhong Li ◽  
Zhiyuan Chen ◽  
Chio-In Ieong ◽  
...  
Keyword(s):  
Solar Cell ◽  
Power Consumption ◽  
Supply Voltage ◽  
Capacitive Sensor ◽  
Cmos Process ◽  
Readout Circuit ◽  
Worst Case ◽  
Average Power Consumption ◽  
Input Range ◽  
On Chip

In this paper, a wide input range supply voltage tolerant capacitive sensor readout circuit using on-chip solar cell is presented. Based on capacitance controlled oscillators (CCOs) for ultra-low voltage/power consumption, the sensor readout circuit is directly powered by the on-chip solar cell to improve the overall system energy efficiency. An extended sensing range with high sensing accuracy is achieved using a two-step successive approximation register (SAR) and delta-sigma ([Formula: see text]) analog-to-digital (A/D) conversion (ADC) scheme. Digital controls are generated on-chip using a customized sub-threshold digital standard cell library. Systematic error analysis and optimization including the finite switch on-resistance, buffer input-dependent delay, and SAR quantization nonlinearity are also outlined. High power supply rejection ratio (PSRR) is ensured by using a pseudo-differential topology with ratiometric readout. The complete sensing system is implemented using a standard 0.18[Formula: see text][Formula: see text]m complementary metal-oxide-semiconductor (CMOS) process. Simulation results show that the readout circuit achieves a wide input range from 1.5[Formula: see text]pF to 6.5[Formula: see text]pF with a worst case PSRR of 0.5% from 0.3[Formula: see text]V to 0.42[Formula: see text]V (0.67% from 0.3[Formula: see text]V to 0.6[Formula: see text]V). With a 3.5[Formula: see text]pF input capacitance and a 0.3[Formula: see text]V supply, the [Formula: see text] stage achieves a resolution of 7.1-bit (corresponding to a capacitance of 2.2[Formula: see text]fF/LSB) with a conversion frequency of 371[Formula: see text]Hz. With an average power consumption of 40[Formula: see text]nW and a sampling frequency of 47.5[Formula: see text]kHz, a figure-of-merit (FoM) of 0.78[Formula: see text]pJ/conv-step is achieved.

Ultra Low Power Capacitive Sensor Interfaces

2007 ◽  
Author(s):  
Wouter Bracke ◽  
Robert Puers ◽  
Chris Van Hoof
Keyword(s):  
Low Power ◽  
Capacitive Sensor ◽  
Ultra Low Power ◽  
Sensor Interfaces

On–Chip Droplets Sensing using Capacitive Technique

2013 ◽  
Vol 61 (2) ◽  
Author(s):  
Mohamad Faizal Abdullah ◽  
P. L. Leow ◽  
M. A. Abd Razak ◽  
F. K. Che Harun
Keyword(s):  
Low Cost ◽  
Microfluidic Channel ◽  
High Sensitivity ◽  
Microfluidic Devices ◽  
Capacitive Sensor ◽  
Sample Volume ◽  
Microfluidic System ◽  
Coplanar Electrodes ◽  
On Chip ◽  
Significant Attention

Significant attention has been given on the development of droplets–based microfluidic system because of its potential and apparent advantages. Beside the advantages of reducing the sample volume, it’s also offer less time consuming for the analysis. Optical and fluorescence among the famous method that was used in detection of droplets but they are normally bulky, expensive and not easily accessed. This paper proposed a simple, low cost and high sensitivity for droplets sensing in microfluidic devices by using capacitive sensor. Coplanar electrodes are used to form a capacitance through the microfluidic channel. The design of eight pair of electrodes was used to detect the presence of a droplet. Changes in capacitance due to the presence of a droplet in the sensing area is detected and used to trigger the microscope to capture the image of detected droplets in microchannel. The measurement of droplets detected and counting are displayed through a LABVIEW interface in the real time.

Fully integrated CMOS capacitive sensor for Lab-on-Chip applications

2014 ◽  
Author(s):  
Ghazal Nabovati ◽  
Ebrahim Ghafar-Zadeh ◽  
Maryam Mirzaei ◽  
Giancarlo Ayala-Charca ◽  
Falah Awwad ◽  
...  
Keyword(s):  
Capacitive Sensor ◽  
Fully Integrated ◽  
Lab On Chip ◽  
On Chip
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