Texas Instruments TRF1500 - Manual (Page 61)

SWRA004A
62 TRF1500 Integrated Dual-Band RF Receiver User’s Guide
6) To determine the 1 dB compression point, the RF P
in
is
increased in steps of 1 dBm until the gain compresses by 1
dB. Repeat step 4 and 5 until the gain compresses by 1dB.
RF P
in
P
out
Gain
-35 -20 15
-34 -19 15
-33 -18 15
-32 -17 15
-31 -16 15
-30 -15 15
-29 -14 15
-28 -13 15
-27 -12 15
-26 -11 14.8
-25 -10.4 14.6
-24 -9.4 14.6
-23 -8.8 14.2
-22 -7.8 14.2
-21 -7.0 14.0
←
1dB Compression Point
-20 -7.0 13.0
Low-Band LNA: Noise Figure
Control state: 011000
SEE APPENDIX A: TEST BENCH SETUPS
Test setup Figure 25
The LNA Noise Figure (NF) is measured at the LNA output port
J15. The measurement is performed using an HP8970B Noise
Figure Meter.
1) Set up the Noise figure meter as follows:
2) Set start; stop frequency (see Table 7) and the step size to
12.5 MHz.
3) Set the smoothing to 16 or above.
4) Insure that the Excess Noise Ratio (ENR) Table on the Noise
Source head in use is entered on the NF meter.
a) On the front panel press ENR button.
b) Check the ENR value by pressing the Enter button or enter
the ENR value for each frequency.