Texas Instruments TRF1500 - Manual (Page 66)

SWRA004A
TRF1500 Integrated Dual-Band RF Receiver User’s Guide 67
Low-Band Receiver Mixer: Power Leakage LO In to RF In
Control state: 011000
SEE APPENDIX A: TEST BENCH SETUPS
Test setup Figure 23
The LO leakage at the RF port is measured at the low band mixer
RF input port, J15. Power leakage is a measure of power in dBm
that couples to the RF port. The measurement is performed using
a RF source and a spectrum analyzer.
1) Set the LO source frequency and input power (see Table 8).
Connect the LO source to the EVM LO input port, J12.
2) Set the spectrum analyzer to measure at the LO frequency
(see Table 8).
3) Connect the RF Port, J15, to the spectrum analyzer.
4) Measure the LO leakage power.
Low-Band Receiver Mixer: Noise Figure
Control state: 011000
SEE APPENDIX A: TEST BENCH SETUPS
Test setup Figure 22:
The low band mixer Noise Figure (NF) is measured at the EVM
Low Band IF output port, J11. The measurement is performed
using an HP8970B Noise Figure Meter. The IF output of the mixer
is converted from differential to single ended using a transformer
balun. The noise figure meter requires a special setup and
calibration since the RF source and receive frequencies are
different.
Set up the noise figure meter as follows:
1) Special Function 1.4 sets the noise figure meter to measure
variable IF and fixed LO frequencies.
2) The IF start, stop, and step size frequencies are set to
100MHz, 120MHz, and 5MHz respectively.
3) Set the smoothing to 16 or above.
4) Ensure that the Excess Noise Ratio (ENR) Table on the Noise
Source head in use is entered on the NF meter.