Texas Instruments TRF1500 manual See Appendix a Test Bench Setups

SWRA004A

Low-Band Transmit Mixer: Third Order Input Intercept Point (IIP3)

Control state: 010100

SEE APPENDIX A: TEST BENCH SETUPS

Test setup Figure 21

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 IF products are equal. The measurement is performed using three RF sources and a spectrum analyzer.

1)Set the first RF source input power (RF Pin) and frequency (F1) (see Table 5).

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, J30.

4)Set the LO source frequency and input power (see Table 5). Connect the LO source to the EVM LO input port, J12.

5)Set the spectrum analyzer to measure at the IF frequency (FIF) (see Table 5).

6)Connect the EVM IF output port, J31 to the spectrum analyzer.

7)Measure the Fundamental output power at the IF frequency (FFund).

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

9)Calculate the Intermodulation Suppression as:

Intermodulation Suppression = FFund - Intermodulation product

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

Input Third-Order Intercept = ((Intermodulation

Suppression/2) + (RF Pin))

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