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low frequency amplifier

Gopal Sarkar
Intellectual 935 points

Dear Friends

I want to process into DSK(c6713) with low frequency signal(range 0.5Hz to 10 Hz). But when this signal frequency going toward below 2 Hz , it's amplitude become very low(1/100 time from actual). So i want to amplify this signal amplitude with in this particular frequency range.
Kindly tell me, which amplifier is better to use for the above purpose & get appropriate result.

wish your kind cooperation.
Regards
Gopal, Kolkata

  • 0
    TI__Guru* 84110 points

    Any op-amp can be used to implement an analog filter in front of your ADC.

    But since you have a perfectly good DSP sitting there, why not use it to filter the incoming data? You will need to look at some of the many app notes on filter design and see if there is a filter type that implements what you want to do.

    Since the frequency range is so low, you can use oversampling to improve your ADC dynamic range for the small signal. For example, if you only need to sample 10-bit resolution at 100 Hz, instead sample at 6400 Hz and take the sum of 64 samples to be your equivalent 16-bit resolution sample at 100 Hz.

    If your goal is to just normalize the signal to some higher amplitude, check zero-crossings and scale the samples between zero-crossings to make the peak be what you want it to be.