A charge amplifier with noise peaking suppression and gain drop compensation utilizing a Quasi-Miller RC network

2019 ◽  
Vol 107 ◽  
pp. 252-256
Author(s):  
Zhen Gu ◽  
Xiaojun Bi
Keyword(s):  
Charge Amplifier ◽  
A Charge

Atomic-scale electric capacitive change detected with a charge amplifier installed in a non-contact atomic force microscope

2016 ◽  
Vol 9 (4) ◽  
pp. 046601 ◽  
Author(s):  
Makoto Nogami ◽  
Akira Sasahara ◽  
Toyoko Arai ◽  
Masahiko Tomitori
Keyword(s):  
Atomic Force Microscope ◽  
Atomic Scale ◽  
Charge Amplifier ◽  
Atomic Force ◽  
A Charge

scholarly journals The photo charge of a bacterioRhodopsin electrochemical cells measured by a charge amplifier

2011 ◽  
Vol 8 (7) ◽  
pp. 505-511 ◽  
Author(s):  
Seiichi Takamatsu ◽  
Kazunori Hoshino ◽  
Kiyoshi Matsumoto ◽  
Tsutomu Miyasaka ◽  
Isao Shimoyama
Keyword(s):  
Electrochemical Cells ◽  
Charge Amplifier ◽  
A Charge

scholarly journals Application of DMA 242 C for Quasi-Static Measurements of Piezoelectric Properties of Solids

2020 ◽  
pp. 97-103
Author(s):  
Pavel P. Turchin ◽  
Vladimir I. Turchin ◽  
Sergey V. Yurkevich ◽  
Pavel O. Sukhodaev ◽  
Irina S. Raikova
Keyword(s):  
Piezoelectric Properties ◽  
Mechanical Stresses ◽  
Experimental Device ◽  
Sample Holder ◽  
Frequency Range ◽  
Charge Amplifier ◽  
A Charge ◽  
Measuring Scheme

An experimental device for quasi-static measurements of piezoelectric moduli dijk, based on the possibilities of precision variations in mechanical stresses with the device DMA 242 C in the frequency range 0-100 Hz has been developed. A special sample holder and a charge amplifier are used in the measuring scheme. The measurements of piezoelectric moduli values of trigonal piezoelectric single crystalls La3Ga5SiO14 (P321) and YAl3(BO3)4 (R32), as well as hexagonal ZnO (P63mc) have been carried out

Investigations on the Equivalent Magnetic Noise of Magneto(Elasto)Electric Sensors by Using Modulation Techniques

2014 ◽  
Vol 605 ◽  
pp. 344-347 ◽  
Author(s):  
Xin Zhuang ◽  
Marc Lam Chok Sing ◽  
Christophe Dolabdjian ◽  
Peter Finkel ◽  
Jie Fang Li ◽  
...  
Keyword(s):  
Noise Source ◽  
Low Frequency ◽  
Layered Composite ◽  
Synchronous Detector ◽  
Magnetic Noise ◽  
Charge Amplifier ◽  
Modulation Mode ◽  
Modulation Techniques ◽  
Strong Amplitude ◽  
A Charge

The equivalent magnetic noise of the magnetoelectric (ME) layered composite sensors has been investigated for various modulation techniques. The ME thin film response to an electric modulation or a magnetic modulation can be sensed by using either a charge amplifier or a coil wound around the sample and then demodulated by a synchronous detector. The equivalent magnetic noise for these excitations methods has been compared. As expected, the low-frequency fluctuations can be lowered when the magnetoelectric sensor is operated in a modulation mode. Results show that these methods can give the same level of equivalent magnetic noise for a certain strain-excitation. In theory, mechanical noise appears as the only dominant noise source after the demodulation process in the case of a certain strong amplitude excitation carrier signal. By using these modulation techniques, an equivalent magnetic noise level of 10-100 pT/Hz at 1 Hz was achieved with DC capability.

A pyroelectric polymer infrared sensor array with a charge amplifier readout

1999 ◽  
Vol 76 (1-3) ◽  
pp. 145-151 ◽  
Author(s):  
D. Setiadi ◽  
H. Weller ◽  
T.D. Binnie
Keyword(s):  
Sensor Array ◽  
Infrared Sensor ◽  
Charge Amplifier ◽  
A Charge

A Charge Amplifier Based Complementary Metal–Oxide–Semiconductor Analog Front End for Piezoelectric Microphones in Hearing Aid Devices

2019 ◽  
Vol 15 (3) ◽  
pp. 315-322
Author(s):  
Manu Chilukuri ◽  
Sungyong Jung ◽  
Hoon-Ju Chung
Keyword(s):  
Hearing Aid ◽  
Complementary Metal Oxide Semiconductor ◽  
Low Noise ◽  
Oxide Semiconductor ◽  
Cmos Process ◽  
Charge Amplifier ◽  
Front End ◽  
Analog Front End ◽  
A Charge ◽  
Cascode Current Mirror

In this paper, a low noise and low power analog front end for piezoelectric microphones used in hearing aid devices is presented. It consists of a Charge Amplifier, followed by a Variable Gain Amplifier and an Analog-to-Digital Converter. At the core of charge amplifier a two stage opamp with modified cascode current mirror is designed which achieves a gain of 93 dB and phase margin of 62°. Designed analog front end achieves an input referred noise of 0.12 μVrms and SNR of 74 dB. It consumes power of 430 μW from 1.8 V supply and occupies an area of 1.2 mm × 0.22 mm. Proposed circuit is designed and fabricated in 0.18 μm CMOS process. Designed circuit is interfaced with a sensor model of piezoelectric microphone, which mimics Ormia ochracea's auditory system, and its performance is successfully verified against simulation results.

CHARGE AMPLIFIER DESIGN METHODOLOGY FOR PVDF-BASED TACTILE SENSORS

2013 ◽  
Vol 22 (08) ◽  
pp. 1350066 ◽  
Author(s):  
LUIGI PINNA ◽  
MAURIZIO VALLE
Keyword(s):  
Design Methodology ◽  
Tactile Sensor ◽  
Charge Amplifier ◽  
Tactile Sensors ◽  
Ic Design ◽  
Mode Behavior ◽  
Piezoelectric Polymer ◽  
Single Sensor ◽  
Amplifier Design ◽  
A Charge

This paper proposes and describes a charge amplifier-based interface electronics design methodology approach for piezoelectric polymer tactile sensors to be used for humanoid robot applications. The tactile sensor–consisting of a PVDF single sensor element–is illustrated, the electromechanical thickness mode behavior is modeled and a fabricated prototype is presented. The model allows associating the PVDF charge response to the effective load applied on the outer surface of the sensor. The model is also used as a key in the proposed design methodology to estimate the charge to be detected by the charge amplifier. A case study based on the design methodology approach is reported. The system (PVDF single taxel + interface electronics) is analyzed firstly, considering it as ideal and then when the nonidealities come into play. A charge amplifier-based interface electronics prototype is also presented. The implementation is used to validate the followed approach and then defining the design specs towards the dedicated IC design. Some experimental results are also reported.

scholarly journals The influence of source impedance on charge amplifiers

ACTA IMEKO ◽  
2014 ◽  
Vol 2 (2) ◽  
pp. 56 ◽  
Author(s):  
Henrik Volkers ◽  
Thomas Bruns
Keyword(s):  
Measurement Uncertainty ◽  
Systematic Errors ◽  
Uncertainty Budget ◽  
Charge Amplifier ◽  
Source Impedance ◽  
A Charge ◽  
Measurement Uncertainty Budget

This contribution discusses the influence of the source impedance on the complex sensitivity of a charge amplifier (CA). During calibration of a CA with varying source impedances deviations at higher frequencies were observed, which if not properly taken into account may generate systematic errors beyond the limits of the measurement uncertainty budget. The contribution discusses a model to describe the effect as well as an extension to established CA calibration procedures which allow to quantify and correct the effect.

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