Jess Chen
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Did you include in your schematic a separate independent signal source with frequency equal to the internal frequency of the demodulator? If so, did you give that independent source a name? Although you can specify the frequency of the internal LO, there is no way to give it a name that SpectreRF can access. Consequently, you must include in your schematic a named source with the proper frequency. It sounds like perhaps your QPSS analysis has one more frequency than your PSS analysis and that frequency is associated with the internal demodulator LO.
-Jess
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