m8ta
You are not authenticated, login.
text: sort by
tags: modified
type: chronology
{512} is owned by tlh24.{510} is owned by tlh24.
{1282}
hide / / print
ref: -0 tags: polyimide adhesion aluminum integrated circuit date: 05-07-2014 19:29 gmt revision:0 [head]

Polyimide insulators for multilevel interconnections Arthur M. Wilson

  • Old article (1981), but has useful historical information on the development of various PI insulators and their adhesion to aluminum, SiOx, etc.
  • Suggests that a higher-temperature cure (400C) is needed to fully drive water from the PI & cause a glass-transition. Might want to do this for the second PI layer.

{1187}
hide / / print
ref: -0 tags: neural recording topologies circuits operational transconductance amplifiers date: 01-02-2013 20:00 gmt revision:0 [head]

PMID-22163863 Recent advances in neural recording microsystems.

  • Decent review. Has some depth on the critical first step of amplification.

{985}
hide / / print
ref: Obeid-2003.02 tags: Obeid integrated circuits recording Morizio Nicolelis date: 01-15-2012 04:35 gmt revision:2 [1] [0] [head]

IEEE-1185151 (pdf) Two multichannel integrated circuits for neural recording and signal processing

  • pretty basic, nothing tricky. Actually, they are rather scarce with the details -- Morizio?
  • all 16 capacitors are placed off chip; on chip capacitors are only 950e-18 F/um^2 or 0.001pF/um^2 in the process they use.
  • designs with this circuit topology were rejected for noise concerns, as they would require resistors as large as 10G for to realize gain and filter cutoff.
    • and yet Reid's chips seem to be working fine without external capcitors ...
  • have variable gain (but not AGC).
  • 5uV RMS input noise; 3.5uV for the plexon headstage.

____References____

Obeid, I. and Morizio, J.C. and Moxon, K.A. and Nicolelis, M.A.L. and Wolf, P.D. Two multichannel integrated circuits for neural recording and signal processing Biomedical Engineering, IEEE Transactions on 50 2 255 -258 (2003)

{831}
hide / / print
ref: Blum-2004.01 tags: microstimulator MEA Georgia Blum integrated circuit date: 01-03-2012 06:53 gmt revision:3 [2] [1] [0] [head]

PMID-17271195[0] Models of stimulation artifacts applied to integrated circuit design.

  • for MEAs.
  • Idea: develop a model of the stimulation artifact so they can optimize removal in SPICE.
  • reference documents that say that biphasic stimulation + active artifact suppression (by discharging the electrodes after stimulation, [1]) are acknowledged means of reducing stimulus artifact.
  • artifact appears to be 1ms saturating, 6ms non-saturating pulse.
  • a little light on details.

____References____

[0] Blum R, Ross J, Das S, Brown E, Deweerth S, Models of stimulation artifacts applied to integrated circuit design.Conf Proc IEEE Eng Med Biol Soc 6no Issue 4075-8 (2004)
[1] Jimbo Y, Kasai N, Torimitsu K, Tateno T, Robinson HP, A system for MEA-based multisite stimulation.IEEE Trans Biomed Eng 50:2, 241-8 (2003 Feb)

{833}
hide / / print
ref: Blum-2007.12 tags: stimulation recording Blum integrated circuit ASIC date: 01-03-2012 03:26 gmt revision:8 [7] [6] [5] [4] [3] [2] [head]

IEEE-4358608 (pdf) An Integrated System for Simultaneous, Multichannel Neuronal Stimulation and Recording

  • Use capacitor-feedback amplifier with a seperate feedback amp to provide a DC path.
  • Input amplifier is disabled during stimulation (hopefully without blowing out gate oxide..)
  • Charge stored in the feedback caps acts as a S/H. clever!
  • Due to topology, noise increases with bias current of feedback amp.
  • Stimluation was a measly 9ua.
  • Use a feedback amplifier to actively discharge the electrode after stimulation.
  • Generally a well-though-out, informative paper, with insight as to the design compromises.

Blum RA, Ross JD Brown EA and DeWeerth SP (2007) An Integrated System for Simultaneous, Multichannel Neuronal Stimulation and Recording IEEE Trans. Circuits Syst. I. Regular Pap 54, 2608-2618

{60}
hide / / print
ref: Douglas-1991.01 tags: functional microcircuit cat visual cortex microstimulation date: 12-29-2011 05:12 gmt revision:3 [2] [1] [0] [head]

PMID-1666655[0] A functional microcircuit for cat visual cortex

  • Using in vivo stim and record, They describe what may be a 'cannonical' circuit for the cortex.
  • Not dominated by excitation / inhibition, but rather cell dynamics.
  • Thalamus weaker than poysynaptic inupt from the cortex for excitation.
  • Focuses on Hubel and Wiesel style stuffs. Cats, SUA.
  • Stimulated the geniculate body & observed the response using intracellular electrodes from 102 neurons.
  • Their traces show lots of long-duration inhibition.
  • Probably not relevant to my purposes.

____References____

[0] Douglas RJ, Martin KA, A functional microcircuit for cat visual cortex.J Physiol 440no Issue 735-69 (1991)

{228}
hide / / print
ref: engineering notes-0 tags: cascode amplifier jfet circuit audio miller effect input capacitance date: 03-03-2007 04:15 gmt revision:0 [head]

http://www.borbelyaudio.com/adobe/ae599bor.pdf

  • a good tutorial on using JFETs for audio amplifier applications
  • shows use of a cascode topology to reduce the miller input-capacitance.