Texas Instruments TRF1500 manual Low-BandCascaded 1dB Blocking Point

SWRA004A

-24	0.4	24.4
-23	1.2	24.2
-22	2.2	24.2
-21	3.0	24.0	←1dB Compression Point
-20	3.0	23.0

Low-Band Cascaded: 1dB Blocking Point

Control state: 011000

SEE APPENDIX A: TEST BENCH SETUPS

Test setup Figure 21

The 1dB Blocking Point is a measurement of the power (dBm) of the interfering signal, measured at the EVM IF output port J11. The measurement is performed using three sources and a spectrum analyzer.

1)Set the RF source frequency and input power (see Table 3).

2)Set the RF Blocking source frequency to the RF frequency minus 45 MHz at -30dBm input power.

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

4)Set the LO source frequency and input power (see Table 3). Connect the LO source to the EVM LO input port, J12.

5)Set the spectrum analyzer to measure the output power at the IF frequency.

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

7)To determine the 1dB Blocking Point, increase the RF Blocking source input power until the output power at the IF frequency is decreased by 1dB.

8)Disconnect the Blocking source.

9)Connect the Blocking source directly to the spectrum analyzer, and change the spectrum analyzer’s frequency to the frequency of the Blocking source.

10)Measure the power of the Blocking source.

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