Texas Instruments TRF1500 - Manual (Page 53)

SWRA004A
54 TRF1500 Integrated Dual-Band RF Receiver User’s Guide
b) Next, press the Noise Figure and Gain Button. The
corrected LED just above the button should be lit.
c) Calibration is complete. Enter the desired IF frequency to
measure.
Next, the external equipment Loss is considered (RF cable,
Transmission line, filter and circulator).
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) 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) Connect the noise source directly to the EVM RF input port,
J30.
8) Connect the LO source to the EVM LO input port, J12.
a) Set the LO source at the nominal power and frequency
(See Table 5).
b) Each LO frequency being tested is entered in the Noise
figure meter by using Special function 3.1.
9) Connect the EVM IF output port, J31, to the noise figure meter
input port.
10) Measure the Noise Figure.
Low-Band Transmit Mixer: Input Return Loss
Control state: 010100
The cascaded input return loss of the low band transmit mixer is
measured at the EVM low band RF input port, J30. The
measurement is performed using a network analyzer.
Set up the network analyzer as follows to measure the RF input
return loss: