Texas Instruments TRF1500 manual Low-BandLNA Stand-AloneTest Guide, Low-BandLNA Gain

SWRA004A

Low-Band LNA Stand-Alone Test Guide

This section involves measuring the Low Band LNA by itself. All unused ports are terminated into 50Ω. Before measuring the low band LNA by itself the EVM board must be modified as follows: Remove C12 and place C53. The EVM board is now modified to use J15 as the output port of the LNA.

Table 7. Low-Band LNA Parameters

Parameters	Min	Typ	Max	Units
RF Frequency Range	869	881.5	894	MHz
RF Input Power		-30		dBm
Gain		15.5		dB
RF Input Return Loss		-6.5		dB
RF Output return loss		-14		dB
Isolation		-17.2		dB
Noise Figure		1.8		dB
Third Order Input Intercept Point(IIP3)		-3		dBm
1dB Input compression Point		-13.5		dBm

Low-Band LNA: Gain

Control state: 011000

The LNA gain is measured from the input port J10 through the output port J15. The measurement is performed using a network analyzer.

1)Set up the network analyzer to measure the low band RF frequency range (see Table 7).

2)Set the power range to -35 dBm to -20 dBm,

a)Set the input power to -30 dBm.

3)Perform a full two-port calibration.

4)Connect the low band LNA input port J10 and output port J15 to the S11 and S22 port of the network analyzer respectively.

5)Set the network analyzer to measure S21.

6)Measure the gain

Low-Band LNA: Input Return Loss

Control state: 011000

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