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: Why is two op-amp instrumentation amp not recommended?

    Jonathan9420
    In Section 2.6 of " A Single-Supply Op-Amp Circuit Collection ", it says "However, this topology is not recommended because the first op amp is operated at less than unity gain, so it may be unstable." But: I t looks like both of the op- amps are in a non - inverting configuration...
    on Nov 17, 2009

  • Forum Post: need a help about OP-AMP

    lilly
    Hi everyone! I need your help with the MSP430FG4619 Actually i want 0-10V for my application but MSP o/p is 3.6V so iam using here RRIO amplifier but MSP430F4619 has already internal 3 op-amps so plz tell me is it necessary to connect externally RRIO ? i dnt knw wt i do and iam ne to this MSP430...
    on Feb 25, 2010

  • Forum Post: need a help about op-amp

    lilly
    hello! i am trying to generate 0-10V analog o/p from my Microcontroller by connecting the external op-amp so plz tell me which op-amp is better and what is this rail to rail opa?
    on Apr 21, 2010

  • Forum Post: Very High Input Impedance Buffer Amp

    Arvo Palm-Leis
    Hi! I'm trying to build a buffer amplifier with input impedance ~100 MΩ. Using the BB OPA277 with ~1MΩ the output drifts about 0.5V. At 100 MΩ it's almost to the V+ rail. How can I get the input impedance up? Thanks!
    on May 20, 2010

  • Forum Post: TLC2264AID date codes help & output capability differences

    sean52200
    Hi, I was wondering if anyone knows or runs into some limitations with these TLC2264AID: http://focus.ti.com/docs/prod/folders/print/tlc2264a.html some questions: What’s the difference between these date codes (above marking “2264AI”): 71CK8TM and 17CH1HT? the markings...
    on Jun 23, 2010

  • Forum Post: Guard Ring

    Andreas Zoellner
    Hello I am designing an photodiode amplifier with an OPA129. I have a question regarding the guard rings mentioned in the document http://focus.ti.com/lit/ds/symlink/opa129.pdf Figure 3 shows how to route the guard ring on the pcb, Figure 2 shows where to connect it. In my case with an inverting...
    on Jul 30, 2010

  • Forum Post: Attenuator Frequency Response

    Alex52381
    Hello, I am designing an attenuator and follower stage for voltage measurements. I have designed the voltage divider to do a divide by 20 function. The max amplitude that I will see is 20V. Therefore, this would bring my voltage into the range of 1V for my ADC. During my design process, I read that...
    on Aug 3, 2010

  • Forum Post: Photodiode Amplifier problem

    alley1122
    hello! I do not have a lot of basic electronics background but I need a simple photodiode amplifier circuit for my project. The optical beam received has intensity of a few microwatts and the photodiode amplifier circuit is needed to convert the optical signal into a voltage one. I am using a Hammamatsu...
    on Aug 12, 2010

  • Forum Post: Re: Photodiode Amplifier problem

    Vinay Shrivastava
    Hi , Like your case i am also poor in electronics background however having reasonable control in MCU . In my project i need to use photodiode as position sensor by detecting laser light falling on the photodiode . I plan to use ADCs of microcontroller and scan voltages across all photodiodes . One having...
    on Sep 8, 2010

  • Forum Post: looking for the photodiode preamplifier (the input current of typically 5-50 nA)

    Alex Baikov
    I'm looking for the photodiode preamplifier for a useful frequency range of at least 0-100 kHz with incident light powers of 10 nW. The chosen diode for this application is model FDS100 from Thorlabs. It has a sensitivity of roughly 0.50 A/W at 800 nm, an operating bias voltage...
    on Dec 10, 2010

  • Forum Post: Re: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    Neil Albaugh
    Grant; Your recommendations are all excellent but one-- that one is a trap that almost everyone falls into when first designing photodiode amplifiers. :...use as large a photodiode as you can but then be careful that the capacitance doesnt become too large to limit the frequency...." That...
    on Apr 25, 2011

  • Forum Post: Re: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    Neil Albaugh
    David; The best photodiode for your application depends on your signal level and bandwidth requirements as well as on the wavelength of your optical signal. High speed photodiodes are generally optimized for longer wavelengths while general purpose photodiodes peak at a shorter wavelength, even "blue...
    on Apr 25, 2011

  • Forum Post: bad slew rate??

    Mauricio Pagano
    Hi, to measure the settling time of a multiplexer (CD4051), opamp (LM324) and ADC, I assembled the following circuit. First select the input to ground (CH1) of the multiplexer and then select the entry with 50mV (CH0). In the oscilloscope see the following signs: ch2 -> pin 3 of CD4051 (multiplexer...
    on May 18, 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: adjustable sallen key filter design

    BRIAN PENG
    Dear sir: I got an application problem when designing my sallen key filter. I want to make filter bands adjustable through switching the capacitors as attached. I plan to switch S1, S3 together in lower band and switch S2, S4 together in higher band. Is there any concern of this design? Should...
    on Oct 12, 2011

  • Forum Post: INT- Single supply for OPA228/OPA188

    Hawk Tong
    Dear all, One of my cusotmer use OPA4228 to measure current shunt drop out voltage. since there is only one 12V is avaialble, i suggest the customer change the reference voltage to 6V. however, i failed to get any result in TI TINA. Note, input current is 20kHz, 80Ap-p signal. My question is...
    on Nov 28, 2011

  • Forum Post: PGA112 Gain Issue

    jun yang46050
    Hi, I tested an Gain-programmable circuit which uses IC - PGA112. The circuit is shown as below: The input signal is connected to C174 then into CH1. The amplified output can be measured at Min2 or RLine1. Its gain is controlled by SPI. PGA112 has binary gain (6db step). As a testing result...
    on Nov 30, 2011

  • Forum Post: OPA1642 Dual Opamp Not Working in Balance Differential Mode

    Dan R
    (Please visit the site to view this file) Any help is appreciated on this one. The OPA1642A is specified with 10^13 Ohms common mode and differential mode input impedance, and less than 20pA of input bias current. Why in the world would the non inverting inputs be drawing more than 1.5uA? The resulting...
    on Dec 30, 2011

  • Forum Post: External offset trim of TLC07X and TLC08X op amps

    Jim McGarvey
    When using an external offset trim pot on these ICs, which supply should the pot wiper connect to? The data sheets are inconsistent... TLC07X data sheet: Wiper to VDD- (What's that??) TLC08X data sheet: Wiper to VDD (Positive supply) Application Report SLOA045 "Nulling offset voltage...
    on Feb 12, 2012

  • Forum Post: TLC071CP

    Elaine Almeida
    Hello, I designed a filter using TLC071 because it is supposed to work with a single power supply , but the op amp just works when connected to two power supply. Is there anything I am missing? Thanks
    on Mar 15, 2012

  • Forum Post: Re: Problem with OPA2320

    Yogesh Palkar
    Hello Sir, No I dont have a Gain/Phase analyzer. The schematic is very simple. OPA2320 is fed with an input to the positive pin from a signal generator. The negative pin and the output are shorted. The output is given to a DSO. The positive 2.5V and the negative 2.5V supplies are bypassed using...
    on Mar 20, 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: INA2321 OP AMP Formula

    Jeff Hawkins
    This datasheet for this part can also be found using INA321. My problem is the following: The formula for the datasheet basically says that the Op-Amp is NOT V(ref) dependent. However, my results say otherwise. We are using this op-amp to amplify the signal of a dual-bridge rotary sensor. The bridges...
    on Jun 13, 2012

  • Forum Post: Custom precision amp

    Iain Martin
    Hello everyone I am new here and am trying to find a equivalent op amp to the LM4881M and the LME49710 the (OPA2227) is what I hear to be a good all rounder, for low and high impedance. Most of the headphones I have are up to 50 ohms, but I have one that is 300 ohm impedance, and wondered if there...
    on Jul 24, 2012
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