Texas Instruments TRF1500 - Manual (Page 62)

SWRA004A
TRF1500 Integrated Dual-Band RF Receiver User’s Guide 63
c) After entering the ENR for the desired frequency, press the
Frequency button on the front panel to exit.
5) To calibrate the NF Meter:
a) Connect the Noise Source directly to the NF meter; press
the calibration button twice.
b) Next, press the Noise Figure and Gain Button. The
corrected LED just above the button should be lit.
c) Calibration is complete.
Next the external equipment loss is considered (RF cable,
Transmission line).
6) The Losses are entered in the Noise Figure Meter by using
special function 34.x.
a) Special Function 34.1 turns on the Loss compensation
factor.
b) Special Function 34.2 is used to enter the loss before the
DUT.
c) Special Function 34.3 is used to enter the room
temperature in Kelvin (300
°
K).
d) Finally Special Function 34.4 is used to enter the loss after
the DUT.
e) Special Function 34.0 is used to turn off the loss
compensation factor.
The noise figure is measured as follows:
7) Connecting the noise source directly to the Low Band LNA
input port, J10.
8) Connect the EVM LNA output port, J15, to the noise figure
meter input port.
9) Measure the noise figure for each frequency.
Low-Band LNA: Third Order Input Intercept Point (IIP3)
Control state: 011000
SEE APPENDIX A: TEST BENCH SETUPS
Test setup Figure 26