Answered

• RE: Alternative to OP140 with increased V_CM

  

  Bruce Trump

  Resolved

  Steffen, Handling +/-10V signals on a +/-12V supply is a tight squeeze for this type of op amp. For a multiplexed input you would probably want a JFET or CMOS input. OPA132 is specified for 2.5V from the rail with a typical of 2V. A near miss. OPA171…

  • over 10 years ago
  • Amplifiers
  • Amplifiers forum

• RE: Integrator up to 1MHz

  

  Bruce Trump

  Kimmo, Here is a possible circuit for your consideration. It behaves as a good integrator from approximately 50Hz to over 1MHz. The OPA140 is shown but the OPA132 would also work well. The response in the 1MHz region would not be quite as good as the…

  • over 11 years ago
  • Amplifiers
  • Amplifiers forum

• RE: OPA140 Alternative

  

  John Caldwell

  Hassan, The OPA132 can be considered the "old-fashioned" version of the OPA140. Although its open loop output impedance is not characterized in the datasheet, the spice macromodel can be used to generate a reasonable approximation: While this…

  • OPA132 Zout Beta.TSC

  • over 11 years ago
  • Amplifiers
  • Amplifiers forum

• Re: precision diode using OPA277

  

  Bruce Trump

  Akhilesh, Two minor changes will make a dramatic change in your simulation: Change the diode to 1N4148. The 1N1183 is a slow rectifier diode that does not recover fast enough when reverse biased. Change the op amp to OPA132. The OPA277 is a bipolar…

  • over 11 years ago
  • Amplifiers
  • Amplifiers forum

• Re: OPT101 - changing responsivity, dynamic response and a wideband frequency compensation circuit (essentially a differentiator to restore the frequency response)

  

  Alex Baikov

  Bruce! Which OpAmp will be better to add a flat gain of 15 or so... I think about TLE2071, OPA132, OPA140 and OPA141. What would you recommend?

  • over 12 years ago
  • Amplifiers
  • Amplifiers forum

• Logarithmic amplifier

  

  Manuel Fernandez-Ros

  Other Parts Discussed in Thread: OPA132 Hi, I need to use a logarithmic amplifier in my design. My signal is differential form -1 V to + 1V, but I don't find an Application Note where it explains how I can do it. ¿Do you know any AN for this?…

  • over 12 years ago
  • Amplifiers
  • Amplifiers forum
Answered

• Re: AC constant curretn source

  

  Bruce Trump

  Resolved

  Matthias, This appears to be a one-of-a-kind science experiment, not a production design. Is that correct? A Howland current source is probably the best approach. It may suffice to use an OPA132 op amp. It is available in DIP package which would facilitate…

  • over 12 years ago
  • Amplifiers
  • Amplifiers forum
Answered

• Re: OPA376 output noise

  

  Marek Lis

  Resolved

  Mujahid, I would suggest you use the free Tina-TI simulation tool together with op amp macro-models to test your configuration to make sure you operate the devices in a linear region. You may download the free version of Tina-TI at the following…

  • over 12 years ago
  • Amplifiers
  • Amplifiers forum
Answered

• RE: OPA314 - the measurement of En(Input voltage noise density)

  

  Tim Green1

  Resolved

  Measuring noise involves eliminating many variables that can cause erroneous readings. I attach a PowerPoint op amp noise for your review to study and see how you are measuring noise relative to the key information contained in attached. The link below…

  • over 7 years ago
  • Amplifiers
  • Amplifiers forum

• Re: help of design of active band reject filter

  

  Bruce Trump

  Kok, I cannot see that the topology that you have shown can do what you want. Here is a possible implementation. It is a 60kHz Twin-T with a single pole at 800kHz. Your circuit appears to have the input signal biased at 0V with the op amps powered from…

  • over 12 years ago
  • Amplifiers
  • Amplifiers forum

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