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  • Forum Post: Re: A problem in implementing OPA657

    Kristoffer Flores
    Hi, Can you please attach a schematic of the OPA657 circuit you are using and an oscilloscope capture with the noise you are seeing? Are you seeing this noise with no input signals? The OPA657 could be oscillating - the minimum recommended gain is +7V/V.
    on Feb 28, 2011

  • Forum Post: OPA847 output impedance for cascade

    Merlin Cooper68095
    Dear all, I wish to receive a clarification of the paragraph on page 10 of the OPA847 datasheet which states: "If the signal source is actually the low impedance output of another amplifier, RG should be increased to be greater than the minimum value allowed at the output for that...
    on Mar 1, 2011

  • Forum Post: Re: Warm-up of the THS4130

    Miki Wolf
    Kristoffer - thank you very much for your quick response, and for the correct analysis!!! I've measured the output of one of the amplifiers by a scope, while the inputs were shorted to ground, and realized that it is oscillating at about 3MHz, 130mVp-p or more. Then I disconnected the outputs...
    on Mar 28, 2011

  • Forum Post: Re: Photodiode TIA - Equivalent Input Noise - OPA847

    Neil Albaugh
    Albert; "I am developing a Transimpedance Amplifier based on the OPA847 for very small currents originating from a photodiode...." Please look at the OPA847 input bias current spec; it is about 42 uA maximum! This is going to make a VERY poor transimpedance amplifier for small photocurrents...
    on May 9, 2011

  • Forum Post: Re: LMH6624

    Andres Torre
    Hello, Thank you very much for the information, I have found it very useful. About the gain, I was a mistake writing the post, you are right about the resistors. This is my new circuit, I have followed your advices. My circuit would measure from 0-10V sensors and -5v-+5V sensors, depend on switch...
    on Mar 23, 2012

  • Forum Post: Re: LMH6624

    Andres Torre
    Hi Hooman, thank you very much for your help, If I connect +5V directly to switch left hand, output voltage increases 7.5V, so if input is -5V, OPA209 output is 2.5V instead of 0V, and if input is +5V, the output is 7.5V instead of 5V. I think I should connect the switch left hand to 2.5V. You...
    on Mar 26, 2012

  • Forum Post: Re: LMH6624

    Andres Torre
    Hi Hooman, Thank you very much for yours explanations, they are really useful for me. I think I will probably use the Zener scheme because I think it has the most stable output and it is more independent of +5V input (Because I am not sure +5V are really stable) but I think this scheme is the most...
    on Mar 27, 2012

  • Forum Post: LMH6624

    Andres Torre
    Hello, I would like to know If I can use LMH6624 to convert a signal 0-10V to 0-5V. I would supply it with +12V-0V. I have a sensor whose output is 0V to 10 V and I need to convert it to 0V to 5V because that is the input of the ADconverter. I think I should make this circuit: Uploaded with...
    on Mar 22, 2012

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