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| Very high resolution circuit |
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| OM222O:
I meant the noise between the digital and analog sections. For the power input I will be using a huge capacitance multiplier circuit (2 stages, each using a 47u tantalum and a 10k resistor) as well as two different LDOs (LM2940CT-5.0/LF01 for the analog section and a much cheaper one for the digital section ... I can't remember the exact part number but I don't think it matters tbh).There are more 47u tantalums on the outputs as well. this is used to measure extremely small voltage drops across shunt resistors (10uV accuracy is required for my application which is why I said 5uV error would be acceptable). I know the first thing that comes to mind is a current sense amplifier, but I want to use it over a wide range of resistor values using the PGA and a switchable current source (1mA/10mA/100mA/1A) so a current sense amplifier is not a good choice in my case. Why do you say it's bad to have them on entirely different planes and not just a slot in the middle? it should be more effective if anything. |
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