Texas Instruments TRF1500 manual 8Calculate the Intermodulation Suppression as

SWRA004A

The third order input intercept point is the level of the RF input power at which the output power levels of the undesired intermodulation products and the desired products are equal. The measurement is performed using two RF sources and a spectrum analyzer.

1)Set the first RF source input power (RF Pin) and frequency (F1) (see Table 7).

2)Set the second RF source frequency to the first RF frequency plus 60kHz; F2.

3)Using a RF combiner, connect the RF sources to the EVM RF input port, J10.

4)Set the spectrum analyzer to measure at the RF frequency (F1) (see Table 7).

5)Connect the EVM IF output port, J11 to the spectrum analyzer.

6)Measure the Fundamental output power at the RF frequency (FFund).

7)Measure the Intermodulation products (2F2 - F1 or 2F1 - F2) at FIF ± 60 kHz

8)Calculate the Intermodulation Suppression as:

Intermodulation Suppression = FFund - Intermodulation product

9) Calculate the Input Third -Order Intercept Point as:

Input Third-Order Intercept = ((Intermodulation

Suppression/2) + (RF Pin))

64 TRF1500 Integrated Dual-Band RF Receiver User’s Guide