Electronic – Why is transformer coupling used in a simple slope detector? Can’t the FM signal be applied directly in parallel to a tuned circuit

demodulationdetectionfmRFtransformer

This is what I mean by simple slope detector:

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Why can't it be like:

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Best Answer

Why is transformer coupling used in a simple slope detector?

You don't need a transformer for a simple slope detector. This circuit would work providing you select the centre frequency to be one side of the LC tank resonant frequency: -

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Or maybe this diagram from an Analog devices article: -

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