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  1. #1
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    Lock -in Amplifier/ tuned amplifier in DSP

    I want to implement a digital filter and tuned amplifier for (39 KHz and 50 kHz) in DSP. Currently the whole implementation of filtering transients and noise and tuned amplifier is in Analog and I would like to implement everything using DSP with excellent noise immunity.

    As the circuit gets its input from the wheel sensor mounted at the tracks and is prone to a lot of noise,is it possible to accurately reproduce the signal using DSP?

    As I am new to DSP,can anyone guide me on how to approach it?
    I was thinking to use Intel cyclone 10 (FPGA with DSP blocks) to implement the design. I could start with Matlab and later convert the code to verilog.

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  2. #2
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    Re: Lock -in Amplifier/ tuned amplifier in DSP

    You can design FIR filters in Matlab and import the filter coefficients to the Intel FIR compiler tool.

    Lock-in is a different approach involving all-digital PLL (NCO, phase detector, synchronous demodulator).



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  3. #3
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    Re: Lock -in Amplifier/ tuned amplifier in DSP

    Hi,

    Digital filters are relatively simple and precise.

    Maybe the bigger problem is the ADConversion.
    The correct sampling rate, resolution and correct precision as well timing and amplitude.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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  4. #4
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    Re: Lock -in Amplifier/ tuned amplifier in DSP

    Quote Originally Posted by bravo1234 View Post
    I want to implement a digital filter and tuned amplifier for (39 KHz and 50 kHz) in DSP.
    Tuned amps are a very narrow band, high gain amplifiers. They are practically filters.

    Quote Originally Posted by bravo1234 View Post
    As the circuit gets its input from the wheel sensor mounted at the tracks and is prone to a lot of noise,is it possible to accurately reproduce the signal using DSP?
    Noise is not an unwanted signal.
    We should look into whether it is really noise or not. Which parts contribute to that noise? What are the characteristics of this noise?
    Any DSP could chop off the data, but can't create new data from nothingness. Therefore; the proper analog design is crucial for any sensor app.

    Quote Originally Posted by bravo1234 View Post
    As I am new to DSP,can anyone guide me on how to approach it?
    I was thinking to use Intel cyclone 10 (FPGA with DSP blocks) to implement the design. I could start with Matlab and later convert the code to verilog.
    1)Write sensor requirements down; dynamic range, offset, nonlinearity, noise, etc...
    2)How can solve these problems?
    For instance; It is difficult to make a Kalman filter in analog, so I should put this in digital.
    Canceling offset in the analog world could solve my dynamic range issues, So I should put those in analog. (Or build a hybrid ?)
    3)Prototype...



  5. #5
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    Re: Lock -in Amplifier/ tuned amplifier in DSP

    Hi,

    See the following post in Business, Promotions, Advertising section of this forum.


    Special Offer....ONEoverT Digital Filter Designer for Firmware and FPGA/ASICs



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