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67 results on '"KMON, Piotr"'

52. An universal test station for multichannel integrated neural amplifiers based on LabVIEW environment.

Author

LISICKA, Agnieszka and KMON, Piotr

Subjects
UNIVERSAL testing machines (Engineering), INTEGRATED circuit design, NEURAL stimulation, MULTICHANNEL communication, BIPOLAR transistor circuits
Abstract

Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016
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53. Analysis of circuits for effective stimulation in neurobiological experiments.

Author

KADŁUBOWSKI, Łukasz and KMON, Piotr

Subjects
NEURAL circuitry, NEUROBIOLOGY, NEURAL stimulation, MICROELECTRODES, PERFORMANCE evaluation
Abstract

Copyright of Przegląd Elektrotechniczny is the property of Przeglad Elektrotechniczny and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016
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63. Integrated circuit for wireless inductive powering implemented in 180nm CMOS process.

Author

Zoladz, Miroslaw, Kmon, Piotr, Otfinowski, Piotr, Rauza, Jacek, and Grybos, Pawel

Abstract

Our report is on the simulation results and the design of the integrated circuit dedicated for inductive powering of a neural recording system on a chip. Four different voltage rectifiers were considered. designed to compare their power efficiency, drop out voltages, and ability to work in a megahertz range. Each of the full bridge rectifiers is equipped with voltage clamps to prevent it from the high coil voltages. Presented circuits are dedicated for carrier signals in the range of a few MHz and load current of 10mA. Performance of the circuits is discussed based on the post-layout simulations. The circuit was designed in 180nm CMOS process and sent to fabrication. [ABSTRACT FROM PUBLISHER]

Published
2012

64. Area efficient low power neural amplifiers using MOS and MIM capacitors in submicron technologies for ultra low corner frequencies.

Author

Kmon, Piotr, Grybos, Pawel, Szczygiel, Robert, and Zoladz, Miroslaw

Abstract

This paper presents the design methods that allow to drastically limit an area of a recording channel in multichannel integrated circuits dedicated to neurobiology experiments. The techniques that are presented in this paper allow to apply them in a 3D pixel multichannel integrated systems where area limitations are very strict. Furthermore, these allow one to minimize main problems e\ xisting in modern submicron processes i.e. leakage currents, an ability of obtaining very large MOS based resistances or a uniformity of main parameters of recording channels. For further improvement of the recording channels we designed and processed in a 180nm CMOS technology two recording channels that differ from one other in channel feedback components. The measurement results show that our methods allow to tune the lower cut-off frequency in a very large range, i.e. 10 mHz – 300 Hz. The upper cut-off frequency can be changed into two different modes, i.e. neural spike recording mode where it is equal to 9 kHz or slow biomedical signals recording mode where it can be changed in the 10 Hz – 280 Hz range. The voltage gain of the recording channels can be switched either to 260 V/V or to 1000 V/V. The input referred noise of the recording channel is equal to 5 µV while its power consumption is equal to only 11 µW. The single recording channel occupies only 0.06 mm2 of the chip area and together with its large functionality allows one to adapt it into modern 3D pixel multichannel neurobiology applications. [ABSTRACT FROM PUBLISHER]

Published
2012

67. Dynamic Scaling of Colloidal Gel Formation at Intermediate Concentrations.

Author

Qingteng Zhang, Bahadur, Divya, Dufresne, Eric M., Grybos, Pawel, Kmon, Piotr, Leheny, Robert L., Maj, Piotr, Narayanan, Suresh, Szczygiel, Robert, Ramakrishnan, Subramanian, and Sandy, Alec

Subjects
*COLLOIDAL gels, *DYNAMICS, *X-ray scattering
Abstract

We have examined the formation and dissolution of gels composed of intermediate volume-fraction nanoparticles with temperature-dependent short-range attractions using small-angle x-ray scattering, x-ray photon correlation spectroscopy, and rheology to obtain nanoscale and macroscale sensitivity to structure and dynamics. Gel formation after temperature quenches to the vicinity of the rheologically determined gel temperature, Tgel, was characterized via the slowdown of dynamics and changes in microstructure observed in the intensity autocorrelation functions and structure factor, respectively, as a function of quench depth (ΔT=Tquench-Tgel), wave vector, and formation time tf. We find the wave-vector-dependent dynamics, microstructure, and rheology at a particular ΔT and tf map to those at other ΔTs and tfs via an effective scaling temperature, Ts. A single Ts applies to a broad range of ΔT and tf but does depend on the particle size. The rate of formation implied by the scaling is a far stronger function of ΔT than expected from the attraction strength between colloids. We interpret this strong temperature dependence in terms of cooperative bonding required to form stable gels via energetically favored, local structures. [ABSTRACT FROM AUTHOR]

Published
2017
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