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Amplifier
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  • Forum Post: Instrumentation Amplifier Output Offset

    Jim Gealy
    Greetings, I am building a very simple circuit. I need to take a 0V to 1V signal and produce a -5V to 5V signal. I would like to do this with one of the INA series instrumentation amplifiers. I feel it would be easiest to have one of these units produce a gain of 10 and then offset the signal by 5V...
    on Jul 9, 2009

  • Forum Post: IVC102 for nA measurements

    Gabriel Koutilellis
    I have carefully read the datasheet of this transimpedance amplifier. I have followed the pcb outlines, but I am against some weird behavior. Power supply is +/- 15V and capacitance used is 100pF. So V = - i * T / C = - i * T / (100 pF). When I measure positive currents the transfer function seems...
    on Sep 24, 2009

  • Forum Post: Output Phase Reversal on OPA 544

    Jay Heefner
    Has anyone seen what appears to be an output phase reversal problem on the OPA544? I am using it in a follower configuration. The device is powered on +/-17VDC. When the non-inverting input goes below -14V, the output suddenly reverses phase. I have tried various limit resistors on the input, but they...
    on Oct 13, 2009

  • Forum Post: Ultra low Noise Power Amplifier Circuit for driving Voice Coil Motor

    Gaurav Parmar
    Application: We are making a long range nanopositioning system with range 10mm and resolution 10nm. The mechanism is actuated by voice coil motor which needs a driver. The driver has to deliver high current (for range) with ultra low noise and distortion (for resolution). Specifications for amplifier...
    on Oct 20, 2009

  • Forum Post: ADC buffer question

    Bonnie Baker - WEBENCH Design Center
    Bill, This reason that you have not found any literature on driving the output of single supply amplifiers to ground is that it is not recommended. I know that you have placed a diode at the output and you are trying tricks to pull the output down to ground however you may see significant linearity...
    on Oct 27, 2009

  • Forum Post: TL064 Input Voltage Limits

    Dustin19640
    Hello, I have a TL064 powered with +/- 16.6V. The - Input is connected to GND, and the + input is connected through 12k Ohm to the output of another op-amp also powered with +/- 16.6V, so this input sees 16.6V regularly. The spec sheet for the TL064 states that Vi should not exceed 15V, even if Vcc...
    on Dec 10, 2009

  • Forum Post: Re: OPA2277 HF oscillation

    Junhua Wang
    Can OPA277PA or TLC2652 use single positive power supply only? Regards Junhua
    on Jun 15, 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: ISOLATION CIRCUITS???

    William Hernandez
    Hello I am working with an instrumentation amplifier (INA129) for EMG (electromyography), as I read it seems I need an isolation circuit, but it is not? or is it built?, I thank you for your cooperation.
    on Jul 29, 2010

  • Forum Post: Re: OPA549 heat generation problem?

    Herbert Knopf
    Just a hint: Slewrate is measured with a large voltage step (50Vpp @ G=1), not a sinus wave. The slewrate of the input signal for the measurement has a much higher slewrate than the amplifier, hence the input is overdriven to as much as 50V (V+ minus V-) right from the start. You cannot achieve this...
    on Sep 2, 2010

  • Forum Post: Smaller instrumentation amp with the same noise performance as the INA103

    Andrew Madsen
    I'm working on a a design that requires very low noise. The INA103 works very well in my application, but its SOIC-16 package is much larger than I would like. I'm wondering if there's another available instrumentation amp with a noise figure around 1nV/sqrt(Hz) that comes in a smaller surface...
    on Dec 16, 2010

  • Forum Post: TL971DBV in SOT-23. Available?

    David Nizel
    TL971DBV in SOT-23: Does this part really exist? I have a customer who is designing a circuit board with this part. Can't get samples, isn't listed other than on the data sheet. http://focus.ti.com/lit/ds/symlink/tl971.pdf If it does not exist, what is a suggested pin-for-pin replacement...
    on Jan 20, 2011

  • Forum Post: Current source with OPA381

    Perhirin Steven
    Hi, I would like to create a courent source which could provide 25 mA as constant output current. I read the datasheet(OPA381) and it says that the current typ is 10 mA. I couldn't find how much is the ouput current max. I already have the schematics of my circuit that include an Amplifier. I...
    on Jan 28, 2011

  • Forum Post: Sense amplifiers?

    Nate Koppenhaver
    Hello I'm designing a 16x5 SRAM and I need some type of sense amplifier for the outputs of the SRAM cells. I would just use a SRAM chip, but this is a specialized purpose so I need to build the circuits myself. Any ideas?
    on Feb 8, 2011

  • Forum Post: INA213 max. input voltage on Vcc=0V

    Martin Maurer67449
    Hello, I'm using the INA213. In my application it's possible that Vcc=0V and on the analog input (IN+; IN-) pins are 5V. In the datasheet is written that the analog input (IN+; IN-) pin are able to handle up to +26V. There is no comment of Vcc. => The INA213 isn't destroyed if Vcc=0V and...
    on Feb 21, 2011

  • Forum Post: TPA3112d1 overvoltage issue?

    Pepijn Herman
    Hello, I am building a design with 2 TPD3112d1 amplifiers. My design runs on a 24V li-ion pack. This pack when fully charged puts out 29.5V. When I test my design on the lab powersupply and turn up de voltage slowly on the amplifiers they shut down when I pass exactly 26.1 volts. The fault...
    on Feb 21, 2011

  • Forum Post: TAS5713 in PBTL connection

    DJ
    I am using the TAS5713 in a PBTL configuration and had requested TI tech support insofar as the proper electrical connections. I received the attached drawing showing the connections. I have the TAS5713EVM board which is wired as 2 BTL (stereo) outputs and have noticed that the PCB layout for the boost...
    on Mar 5, 2011

  • Forum Post: TI LT1013 op amp does not follow the input

    Matt Hosler
    I'm using a TI LT1013 op-amp to process the current through a 50 mV shunt. I'm having some issues with the op-amp not performing well in certain conditions and I'm not sure why. It seems that the output of the opamp does not follow the input although the inputs are with Common mode range...
    on Mar 7, 2011

  • Forum Post: TAS5342L UVP

    Rick Kernen
    I'm having problems with the TAS5342L shutting down during heavy music loads. At the point of "shut down" the VDD has dipped to 27.5v from its nominal of 29v. Can you tell me what the TAS5342L undervoltage protection (UVP) threshold is? Can this threshold be changed to allow a little more...
    on Mar 11, 2011

  • Forum Post: Re: Voltage Converter 3v to 10v

    Danish Ahmed
    Well thanks bruce, really it`s working but another issue came up, i want to invert voltages like for 0v to 3v input ,i want to produce 10v to 1v output. Any advice will be helpful . Cheers Bye Bruce
    on Mar 14, 2011

  • Forum Post: Re: Voltage Converter 3v to 10v

    Danish Ahmed
    Thanks Bruce you are a genious thanks for the help.. I was also trying to made a voltage follower for Sharp high Imperdance IR Sensor. this sensor produces 0 to 2.5 volts output, but due to high impedance I cannot use it directly with my scaling circuit. So i want to make a voltage follower. Unfortunately...
    on Mar 24, 2011

  • Forum Post: 0 to 2.5 scaling to 10v to 0v

    Danish Ahmed
    Hi, I am building a sensor to measure the distance, sensor give output from 0 to 2.5 v DC. I want to convert these voltages into 10v to 0 V range. 0v in ---> 10v out 2.5 v in ----> 0 V out So that sensor can easily talk with Inverter ( AC DRIVE ) to control motor speed. I know...
    on Mar 24, 2011

  • Forum Post: OPA4228 unused amplifiers

    dennis pittman
    Is it safe, under all conditions, to strap any unused OPA4228 amps in unity gain follower configuration (OPA4228 is stable with gain>5)? If not, how should unused amps be configured?
    on Mar 30, 2011

  • Forum Post: Scale input of (2.6V - 0.40V) to output (10V - 1.8V)

    Danish Ahmed
    Hi Bruce, In response to our earlier conversation, i have started new thread.. Now i am wondering to scale input of (2.6V - 0.40V) to output (10V - 1.8V) , I can only use positive voltage. Any Help will be very appreciated. Thank you Regards Danish
    on Apr 1, 2011

  • Forum Post: OPA 454 Status pin

    David Mittmann
    I couldn't quite find the answer to these questions on the datasheet. 1)OPA 454. Does the Status pin(5) have to be tied to V+ through a resistor if the status flag is not being used? 2) If using Figure 76 "Output voltage boost" Would the status pin still be tied to the individual...
    on Apr 8, 2011
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