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

    David Walker
    Does anybody in this forum have experience with Photodiode Amps? I am fairly new to the analog design field. I've designed simple inverting amplifiers and band-pass filters before, but now I must design a Photodiode Amplifier. I have a couple different photodiodes made by Hamamatsu (S9219 and S7686...
    on May 22, 2009

  • 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: 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: 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: 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: 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: 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: LOG114

    Teodor Neagoe
    I am looking for answers and suggestions on TI’s LOG114 (Log Amp). LOG114 provides best results when the input is current (for example: photodiode output). However, for my application, we have to use it with voltage source. We would like to monitor the photodiode’s output (pulse) in two ways...
    on May 17, 2011

  • Forum Post: INA12* Large Offset Problem

    Matthew Fredericksen
    Hi all. I have been working on an instrumentational amplifier circuit to amplify a 0-10mv differential voltage (Loadcell) up to 0-2.5V to be read by and Arduino ADC Currently I have tried using an INA129 and an INA128. Both of these amplifiers are giving me about a 80mV offset voltage at the...
    on May 24, 2011

  • Forum Post: Good OpAmp choice for TIA in UI panel?

    Tom Schroetter
    Hello TI community! I am looking for a good opamp (single supply) in a transimpedance amplifier application and was hoping to get some recommendations from the experienced engineers here. We are developing a user interface panel that uses lot's of photodiodes to detect infrared light (pulsed...
    on Jun 5, 2011

  • Forum Post: Need help

    deski beri
    Hello, I am a chemistry student currently working on photoacoustic spectroscopy (frankly speaking; working to build a photoacoustic spectrometer). In my experiment, I am using IIIb series 633 nm HeNe laser, 25 mW , bombarded to malachite green sample in stainless steel compartment, I used a piezoelectric...
    on Jun 27, 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: PGA116 Gain settings not working

    1365631
    I have a design where I have used a PGA116 for it's multiplexing/calibration capabilities and have had this working happily for a while. Now I need to use the gain block and so I have modified the firmware on the processor which controls it (over SPI) to send the new gain setting with the channel...
    on Oct 14, 2011

  • Forum Post: INA103 has a temperature of 41°C

    Alexander Bucher
    Hi I use an INA103 in the same configuration as shown in figure 1 (page 9) in the datasheet. The differential voltage on the inputs is 0 mV to 1000 mV. +/-15 V supply is used an the Gain is 3. If I turn the power on, the INA103 is getting warm and when I add an 1 V input voltage I can measure 41°C...
    on Oct 27, 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: INA149

    Jose Ramos90553
    on Dec 4, 2011
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