Texas Instruments TRF1500 - Manual (Page 56)

SWRA004A
TRF1500 Integrated Dual-Band RF Receiver User’s Guide 57
-31 -12 19
-30 -11.2 18.8
-29 -10.2 18.8
-28 -9.2 18.8
-27 -8.4. 18.6
-26 -7.6 18.4
-25 -7.8 18.2
-24 -6.0 18.0
←
1dB Compression Point
-23 -5.5 17.5
Low-Band Transmit Mixer: Second Order Input Intercept Point
(IIP2)
Control state: 010100
SEE APPENDIX A: TEST BENCH SETUPS
Test setup Figure 21
Input intercept point is the level of input RF power at which the
output power levels of the undesired intermodulation products and
IF products are equal. The second order intercept point is
measured at the IF output port, J31.
1) Set the RF source input power (RF P
in
) and frequency (see
Table 5).
2) Set the LO source input power and frequency (see Table 5).
Connect the LO source to the EVM LO input port, J12.
3) Set the spectrum analyzer to measure at the IF frequency (see
Table 5).
4) Connect the EVM IF output port, J31 to the spectrum analyzer.
5) Measure the IF output power (IF 1P
out
) at the IF frequency.
6) Increase the RF frequency by half the IF frequency.
7) Measure the IF output power (IF 2P
out
) at the IF Frequency.
8) Calculate IIP2 as: IIP2 = RF P
in +
[IF 1P
out
- IF 2P
out
]