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Designing high gain, low noise, low input amplifier?

Question asked by Sean on Mar 30, 2010
Latest reply on Jan 14, 2013 by J3627

This is my first time trying to develop a design entirely within a DSP processor.  I am using the ADAU1761 eval board.

My design requirements will have a differental input mono signal.  The input can vary between 10uV and Vin max so I need to have not only a variable gain but a low noise figure when the gain is at the maximum.  The DSP will only be used for the A/D and D/A conversions with some filtering in between.  I can tolerate a tapering of the higher freq response in order to help in the more important goals identified.  The output will be used to drive a LINE level and/or headphones.

 

My basic questions are what considerations do I need to keep in mind on the modules to use and the order in which I connect them.  The operation of the design can be controlled both internally to the DSP as well as the PSoC (uC) that I will be using to control the entire product.

 

Any thoughts, no matter how trivial you think they might be, would be greatully excepted!

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