Quad coil dependencies in a Quadrature FM detector

For those using a Quadrature FM detector the following may be useful and interesting: (1) The center frequency of a quadrature detector is dependent to a first order on the LC of the quad coil. So to move the characteristic of the detector in frequency fix L and change C. The easiest to do. (2) To set the differential output swing change the resistor. The output swing is directly proportional to the value of the resistor.

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