Texas Instruments TRF1500 - Manual (Page 33)

SWRA004A
34 TRF1500 Integrated Dual-Band RF Receiver User’s Guide
-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.