Precision Amplifiers

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Precision Amplifiers

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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: 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: TLV237x input protection

    Zdenek Masek
    Hello, I have a qestion about operational amplifier TLV237x . Does it have input protection diodes (from inputs to Vcc and to GND) ? No info in datasheet..... There is a possibility in my application, that input voltage is present when OPAMP is off. OPAMP is connected as voltage follower, single...
    on Apr 12, 2011

  • Forum Post: Please recommend an amp for my application

    Inyong Kwon
    Hello. I am a graduate student in U of Michigan. Our research group has made photodetectors by ourselves. It has been very successful. Now, for the next step, we would like to see the current shape from our detector on a oscilloscope. So, we are looking for special amplifiers because the output current...
    on Sep 13, 2011

  • Forum Post: Load Cell Amplifier ( Large Temperature Range )

    ismail cetinkaya
    I have designed a load cell amplifier with three opamp in amp. I use this amplifier in baby incubator project. I have sensor module inside incubator and my amplifier circuit is in the module. Module temp can be 45-50C some times because of settled temp of incubator. So , my amplifier out changes +-20mV...
    on Nov 26, 2011

  • Forum Post: Re: Noise pick up and controller

    karthick balu
    Thank you .. Mr. Collin Wells p1.0 is comparator reference.... p1.1 is comparator input from amplifier circuit... p1.2 is comparator output and which is connected to the other port.(p1.3).. and this terminal is connected to ground through capacitor(10nf)... i tried it with pcb...
    on Feb 11, 2012

  • Forum Post: 4127 and Log112 Calibration

    Calvin Patel
    Hello, I have several questions, but let me first start off with a basic question based on the 4127 datasheet. On page 6, figure 4, there is a 10k pot with a 100meg resistor used to bias the input current on pin 4. My question is why would you need to bias the input current as well as finely adjust...
    on Feb 14, 2012

  • Forum Post: DC Offset with opa2350

    David Armstrong
    Howdy, I'm using the opa2350 op amp to amplify a <1mV signal by 2000. The problem is I want to have a greater gain (either second stage or larger feedback resistor) however the DC level is reaching too high so that it reaches over 2 V, and I need it under 2 V in order for a digital read into an...
    on Mar 28, 2012

  • Forum Post: single 5v supply amplifier selection

    Calum Mackinnon
    Do you know of a good differential or instrumentation amplifier with the following qualities? Supply Voltage single ended 5V (could go 12V and just current limit the output to the A/D if we can't go over Vcc with the input CM voltage) SMT package Low input / output offset. Ideally below...
    on Apr 6, 2012

  • Forum Post: Would you comment about using epoxy filler on OPA2348?

    AK
    Our customer will use epoxy for waterproofing for their application. When the OPA2348 covered by epoxy, does the OPA2348 work nomally? Device : OPA2348AIDCNR Epoxide manufacturer : Three Bond Base compound : 2001 Curing agent : 2105C *Blend ratio Base compound : Curing agent = 2 : 1
    on Nov 6, 2012

  • Forum Post: RE: the voltage offset OPA2376 for the photodiode ,the current is from 8.7nA to 600uA

    zumao xu
    hi : thanks very much for your replay ,my circuit is just nomally I-V conver circuit ,no bias .votange , the amp is OPA2376 , the sensor is S2386 ,made by hamamatsu. i designed the circuit refer to the website: http://www.jensign.com/transimpedance/index.html . and i also added one the capacitance...
    on Nov 23, 2012

  • Forum Post: Help with amplifier oscillation

    Kevin Mason
    HI, I am relatively new to opamp circuits, but I have designed one that does what I want it to do. The problem is that I am getting a slight oscillation - more like a ripple. There are two amplifiers in the circuit - an INA117 which feeds the non-inverting input of an INA114. I am using a voltage divider...
    on Nov 28, 2012

  • Forum Post: LMH6629: Ultra low-noise amplifier and variable gain.

    Efrain Ovalle
    I'm working on an application where the goal is to amplify a signal which is not known exactly but is estimated frequency is between 100KHz and 20MHz. Similarly there is no record of what may be the amplitude is estimated less than 100nV to be expected to be so small that it is undetectable (pV-fV...
    on Jan 22, 2013

  • Forum Post: oscillation in a low bandwidth(300Hz) trans impedance circuit

    qi wang1
    Hey, I'm now working on a trans impedance circuit using OPA4131(please see the following schematic), the bandwidth is set pretty low @ 330Hz, but the circuit oscillates (~3MHz) with a 10 meter long input cable (just a cable no sensor attached) which was measured having around 500pF capacitance...
    on Feb 6, 2013

  • Forum Post: opa2277u

    mario soccini
    Hi. I have 2 problems: 1) I am using OPA2277U.I have a problem about offset. It's an integrator non-inverting. In inverting i have 7500K (7M5) and 750 (G=10000).In parallel of 7500K i have 100nf.If i put the + input to ground, i find an output of 2V instead a maximum of 200mV. 2) the output doesn't...
    on Apr 19, 2013

  • Forum Post: Need to divide two signals of 1 Hz Sinewave

    Sujit Kr Nayak
    Hello, I am designing a signal divider circuit. Basically my signal conditioning circuit have two inputs (one reference- R, other signal-S ). I want to divide them (S/R). Is there any IC readily available which can perform this action. At the output I just want the divided output of both the signals...
    on May 10, 2013

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