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OPA836: OPA836

Part Number: OPA836
Other Parts Discussed in Thread: LMH6629

Tool/software:

Hi there!

I want to design an amplifier to boost(amplify) a 0.2mVp-p signal with a 32.768KHz input frequency to around 2Vp-p/32.768KHz. I'm planning to use a multi-stage amplifier because the signal is very low, which often leads to noise issues and also a gain is too large to according a Gain Bandwidth Product.

Could you suggest a suitable IC for this purpose? Also, how many stages should I use, and what should be the gain for each stage to achieve the desired output with minimal noise? If you have a schematic for reference, please share it. Please consider the gain-bandwidth product and signal integrity in your recommendations. Also suggest a any ultra-low noise IC.

  • Hi Harsh,

    I was able to put together a two-stage amplifier circuit with the required gain and bandwidth. I chose the LMH6629, as this is one of our lowest noise devices. I was able to limit Vos errors with the use of the capacitors by effectively creating a unity gain circuit at DC. Attached below is the file. I would suggest also looking into our precision portfolio as the gain GBW required to make a two-stage design with these requirements is not relatively high.

    Best Regards,

    Ignacio

    snom340 (4).tsc