How to Rectify 100 Microvolt AC to 1 Volt DC?

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To rectify 100 microvolts AC to 1 volt DC, a step-up transformer is recommended to increase the voltage before using a rectifier circuit. Concerns were raised about the necessity of amplification, as amplifying the signal could introduce errors. A low-noise amplifier (LNA) is suggested as a better option for handling the 100 kHz frequency without increasing noise levels. True RMS to DC converters like AD736/737 and AD536/636/637 were mentioned as potential solutions, with inquiries about their availability in local electronic shops. The discussion concluded with suggestions for sourcing components, including Digi-Key and NewarkInOne, while noting the user's location in India.
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I need to rectify 100micro v ac to 1 v dc. can u suggest a good rectifier schematic. The most rectifier circuit i found on google did to wrok in this micro volt range.
 
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Do you mean "rectify?" Or do you mean amplify? Your question does not make much sense, I'm afraid.

- Warren
 
With my limited electronics knowledge I would say you should first transform the signal with some sort of step up transformer. Then you can pass the higher voltage signal through a rectifier circuit to obtain your 1vdc. Be aware that as you increase the voltage, the current is going to decrease proportionately.

It might help if you explained why you wanted to do this. Maybe there is a better way?
 
I think this is done all the time in a RF receiver. What frequency are you talking about.
 
i am talking about 100khz range and no i cannot amplify the signal first as because it would as it increase the error level
 
What exactly is your application that you can't use an amplifier?
If your 100kHz is so amplitude sensitive that you can't put it through a low noise amp, then it is too sensitive to use a rectifier to detect the envelope.
Also you can't make 100uV into 1V without amplifying it somewhere so do it at the smallest point.
 
100 uV at 100 kHz is no problem at all for a low-noise amplifier. If you somehow think an LNA would produce more noise than a discrete rectifier, well, you're wrong. The right tool would be the LNA.

- Warren
 
chroot said:
100 uV at 100 kHz is no problem at all for a low-noise amplifier. If you somehow think an LNA would produce more noise than a discrete rectifier, well, you're wrong. The right tool would be the LNA.

- Warren


LNA'S are low noise amplifiers. I need a rms to dc convertor that can convert microvols ac to dc
 
I googled and found the following true rms to dc converters AD736/737,AD536/636/637. are this ic s readily available in the market? will i find them in any electonic shops seling ics.

Actuall there are a few shops in my vicinity b but they are all of mdium grades. Large shops are far away and I i do not have a credit card to buy online.

I will be going on tuesday. please advice.
 
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Can you order from DigiKey without a credit card?

Also look into NewarkInOne - they have local sales offices in all states in the US.
 
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i AM FROM INDIA
 
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