Thank you for your kind response.The usual implementation of a precision rectifier uses an operational amplifier. For low frequencies this works fine. The problem at 1 MHz is that you need an opamp that has both gain and linearity at that frequency. I think it will be both difficult and expensive to find. I think that making a stable circuit will also be tricky.
If you could tell us more about the application it might help.
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by Jake Hertz