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ECG
Related Posts

  • Forum Post: Re: INA326 EMG amplifier

    Paul Bjork
    Matt, I'm working on a very similar design using an INA333 and OPA2333 for low power. It is battery powered to +/- 1.5V and the circuit is well laid out. I understand the importance of the input common mode range and varying electrode offset potentials. Same gains as your circuit, overall bandwidth...
    on Nov 12, 2009

  • Forum Post: Re: INA326 EMG amplifier

    Matt Hann
    Hi Paul, I looked over your circuit and there are a couple of things that I noticed that could be improved. With regard your INA333 gain--according to the schematic you are using a gain of 11 which is a little bit on the higher end considering you have electrodes that are prone to higher offsets...
    on Nov 18, 2009

  • Forum Post: Re: INA326 EMG amplifier

    Matt Hann
    Paul, Actually, in light our dialogue, would you mind posting your "resanitized" version? This way any one who is following the thread can see the differences that we are discussing. Your phase margin looks good with a gain of 20--simulation shows about 60 degrees of phase margin in your...
    on Nov 20, 2009

  • Forum Post: Re: EEG system first stage after RC low pass filter below 20Khz I liked LT 1168 I could use some help getting a TI chip that is better

    Nichole Oljaca
    Hi Josh, What is the supply voltage that will work for you? The reason I ask is that the LT1168 and the INA121 are dual supply devices and the INA333 is a single supply device. That may shape your choice. In terms of performance, see below for a quick rundown of comparison with min's and max's...
    on Feb 17, 2010

  • Forum Post: INA326 ECG design questions and problems

    Xijun Chen43069
    Dear all I am a student working on ECG amplifier design. Basically, I followed the design and suggestions from the a paper (see below link) with modifications using INA326 and OPA333/2333. In addition, I have read through the subject of <<INA326 EMG amplifier>> in this forum. ...
    on Feb 19, 2010

  • Forum Post: Re: INA326 ECG design questions and problems

    Matt Hann
    Xijun, I will do my best to provide some answers to your questions. (1) The typical bias current is +/-100pA which means under normal operating conditions the input impedance is much higher than 10M ohms, i.e. more on the order of G ohm range. The OPA333 is an auto zero amplifier that uses a switched...
    on Feb 19, 2010

  • Forum Post: Re: INA326 ECG design questions and problems

    Matt Hann
    Xijun, The OPA333 requires a minimum supply difference of 1.8V. Also, it does not make sense to me that you would be able to input a voltage of 1V to a buffer whose positive supply is only .553V as the amplifier would saturate before hitting your target output. Indeed, this is what I believe is happening;...
    on Feb 22, 2010

  • Forum Post: Re: Driven Right Leg circuit questions

    Matt Hann
    Xijen, You mean you want to AC couple the output of the RL drive? You should be careful about this as the entire circuit derives its common mode voltage from the RL drive and the inverted noise voltage ideally rides on VCM. If you hook up a mid supply DC reference voltage (in place of the RLD) to...
    on Mar 4, 2010

  • Forum Post: Re: Driven Right Leg circuit questions

    Xijun Chen43069
    Hi Matt Many thanks for your quick response. Please see my replies with ">>" You mean you want to AC couple the output of the RL drive? >> Yes. I want to AC couple the RL drive signal at the input of U4 (before R6), see above circuit. You should be careful...
    on Mar 4, 2010

  • Forum Post: DC Restorator for an ECG circuit, please help

    paul miller44746
    All, I am attempting to make an ECG circuit, and I am following the TI application note for the most part. The amplifiers I am using are somewhat different. I am using an INA126 and an LM324 for intrumentation amp and op-amps. I am having several problems the first and most troublesome of...
    on May 29, 2010

  • Forum Post: Re: DC Restorator for an ECG circuit, please help

    joseph raga
    ECG a is technique for recording bioelectrical waves of the heart. This helps clinicians assess and diagnose the stability of a patient’s heart. This has a digital approach that tend to gives the infinite impulsive response, Moreover these tools can be also used in other biomedical signal...
    on Jul 5, 2010

  • Forum Post: EMG/ECG measurement without DRL

    Gustav
    Normally, when you measure EMG or ECG you will have on electrode used as a Driven Right Leg. This DRL will make sure, that the electric potential of the person is correct, so that the input voltage level to the first instrumentation amplifier is within the CMR. Now that more and more EMG/ECG systems...
    on Jul 16, 2010

  • Forum Post: Re: INA326 EMG amplifier

    jainu jogani
    Hello, I implemented EMG circuit using LM308 for instrumentation amplifier. This picture might give you a better idea of the same: Now, instead of using LM308, I am using INA 101 and also, instead of single channel, I am designing it to be multichannel. I had a few questions about INA 101...
    on Apr 12, 2011

  • Forum Post: Re: INA326 ECG design questions and problems

    Matt Hann
    See attached. Eliminating the half supply pedestal and adding the 10M resistor to ground off the output of U4 helps with convergence. Matt
    on Jul 14, 2011

  • Forum Post: TMDXMDKEK1258 Layout/Schematics

    Ben Counsell
    Hello Everyone, I'm wondering if it would be possible for me to obtain or order the schematics for the TMDXMDKEK1258 evaluation board or possibly the CD. I'm working on Integrating the TMDXMDKEK1258 with a National Instruments NI-9631 and having all of the documentation so I can work on bringing...
    on Jul 20, 2011

  • Forum Post: filter design for ECG

    Yamini Goyal
    Hello everyone, We are working towards the betterment of society in a way that we are designing a device that measures ECG. We are facing difficulty in designing low pass filters using TLE2072 series. Basic requirement is a 5V supply, cutoff frequency,150Hz. Please suggest a suitable design. ...
    on Jan 8, 2012

  • Forum Post: TLE 2072

    Anshul Jain99478
    Hello all, I am using TLE2072 for implementing filters. I want my circuit to be battery powered, a 3.7V battery powered, to be precise. My question is, how will I make my TLE 2072 work @ 3.7V. For grounding, should I use virtual ground circuits? My present circuit works on +5V, -5V and it does need...
    on Mar 9, 2012

  • Forum Post: RE: INA333 ECG low supply 1.8V problems

    Bruce Trump
    Tom, The best bias point would be at 0.9V, mid-supply. This would allow the maximum possible input and output voltage range for the INA333. The maximum difference voltage between RLD and other electrodes will vary considerably with environmental conditions and electrode resistance. Please understand...
    on Feb 24, 2013

  • Forum Post: INA128 ECG - need help in designing

    Salil Tembe
    I tried to design an ECG circuit with INA128 in-amp. I do not have much experience in designing so I would be grateful if you can help me in identifying problems in the design. I have posted imaged below. I already constructed a PCB using this circuit and I am able to get noisy ECG signal at the output...
    on Mar 17, 2013

  • Forum Post: RE: 2 Lead dry electrode ECG circuit

    Gargi Roy
    Dear TI, I am also interested in the kind of circuit you mention. It should have a two elctrodes and one common mode electrode for CMR. Can you please send me the ppt file? My email ID is gregariousgargi@gmail.com
    on May 17, 2013

  • Wiki Page: ECG (Heart) Signal Acquisition

    Bruce Trump
    We get many requests for assistance on the design of ECG (heart signal) monitoring. Please understand that, though we have some familiarity with these designs, we are not authorities on the subject. We have never designed production equipment of this type. Requirements for ECG signal acquisition can...
    on May 23, 2013

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