Texas Instruments TRF1500 - Manual (Page 59)

SWRA004A
60 TRF1500 Integrated Dual-Band RF Receiver User’s Guide
Low-Band LNA Stand-Alone Test Guide
This section involves measuring the Low Band LNA by itself. All
unused ports are terminated into 50
Ω
. 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