Texas Instruments TRF1500 manual Low-BandLNA Noise Figure

SWRA004A

6) To determine the 1 dB compression point, the RF Pin 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 Pin	Pout	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.

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