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…
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…
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…
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…
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?…
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…
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…
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…
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…