Combining multiple opamps

Dear Support, Designers,

I am not so familiar with Opamps, but I would like to combine the following circuits with each other. and would greatly appreciate the help I can get in designing this. I have red some theories about opamps, books like opamps for everyone, simulated with Qucs and I aint getting the results I expected using the program, I tried configurations with Differential and selfbuild Operational amplifiers but to no avail, you are probably familiar with this.

Information

What I do know is that the input and the output are connected to a 50 Ohm BNC cable.

0.15V TTL input unipolar and like to amplify it towards 5V with an Potentiometer, and should have a variable bias also connected with a potentiometer.

Configuration(required)

AC to DC Adapter 12V 400mA

LTC3265 Voltage Pump for stable 15+-V

Low pass filter 2 order, Voltage follower, Differential Amplifier.

3x TLV074 for the opamps

Question:

Does the configuration of the opamps need to be all inverted due to negative feedback?

What is the best configuration for the opamps circuits (voltage follower,noninverting filter,inverting amplification)?

what do I need to keep in mind? as in where to start with, and the steps to follow?

is there a general rule for configurations like this?

as a last thought, is it advisable to place extra ELKO's between the 15+- to common? to prevent disturbances from common mode?

sincerely yours

Bastiaan

Parents
  • Hey Bob,

    Thanks for the LTC3265, Power supply, I didnt thought I needed that much on mA for 50Ohm load.

    This is the design I drawn on paper, the Gain circuit needs to go to the back, and the Filter in the beginning.

    This way Ill save amplification of the false signals. I wanted to use the TL072 but as Analog Devices recommends, it is still open to debate. I have never done this before, so Ill jump in and learn it the hard way.

    What should I oppose be doing to change this circuit in a pliable 50 ohm, buffer, filter, Gain, Offset configuration?.

    I am having mine allready in the design program, should I use the following quad opamps for the buffer?

    OPA470

    sincerely yours

    Bastiaan

Reply
  • Hey Bob,

    Thanks for the LTC3265, Power supply, I didnt thought I needed that much on mA for 50Ohm load.

    This is the design I drawn on paper, the Gain circuit needs to go to the back, and the Filter in the beginning.

    This way Ill save amplification of the false signals. I wanted to use the TL072 but as Analog Devices recommends, it is still open to debate. I have never done this before, so Ill jump in and learn it the hard way.

    What should I oppose be doing to change this circuit in a pliable 50 ohm, buffer, filter, Gain, Offset configuration?.

    I am having mine allready in the design program, should I use the following quad opamps for the buffer?

    OPA470

    sincerely yours

    Bastiaan

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