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Design of variable output amplifier

Rekha K
Intellectual 330 points

Hi,

I want to design a system for getting a mono pulse waveform. Input of the system will be coming from a DAC of a micro controller. I want to change the amplitude of cathodic pulse from 0 to 10V in steps of 0.1V according to the output from DAC.

My concern is

1. Suppose the DAC output vary from 0-2V, will an amplifier with gain factor 5 resolves my issue?

2. If  YES, How will select such an amplifier?

3. If NOT, what could be an alternative solution?

thanks for the help is advance

Rekha

  • 0
    TI__Guru 57003 points

    Hi Rekha,

    1. That gain seems correct for your application.  You will need a supply with sufficient headroom for the amp (e.g. +11V).  You might need to verify if the amplifier has rail-to-rail input and rail-to-rail output, if you are concerned about the behavior around 0V.

    2. You need to figure out what bandwidth you need, what offset voltage you can tolerate, and how much of an output load you are expected.  These are three factors that might impact the selection. 

    3.  You could also look at a buffered external DAC that supports +10V operation and forgo the buffer, but you will then need to communicate with the DAC over I2C/SPI.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Intellectual 330 points

    Hi Paul,

    Thanks for the reply. I will go on with your suggestions.

    Regards,

    Rekha