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Design Notes

ACPR Test

This example demonstrates an ACPR measurement for a CDMA signal.

The center frequency is 836.5MHz.  The channel bandwidth is 1.2288MHz.  The ACPR measurement (-63dB) is made 900 kHz offset from carrier and the adjacent channel bandwidth is 30KHz. 

This example uses the VSS complex source (SRC_C) to read in an external IQ data file (IQ_CDMA).

The measured power at the output of the amplifier is approximately 5dBm and can be seen in the "Power in Channel" table.

The spectrum of the signal before and after the amplifier can be seen in the "Spectrum" graph.

The "ACPR at 900KHz offset" table shows average power of the signal before the amplifier (first column) and the ACPR measurement (second column).

The constellation of the signal after the amplifier is shown in the “Constellation” graph.