LMH2120_15 Datasheet, PDF (28/34 Pages) Texas Instruments – LMH2120 6 GHz Linear RMS Power Detector with 40 dB Dynamic Range

LMH2120
SNWS021C – JULY 2010 – REVISED FEBRUARY 2013
2.0
125°C
1.5
100°C
75°C
1.0
50°C
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-50
0°C
-25°C
-50°C
-40 -30 -20 -10 0 10
RF INPUT POWER (dBm)
Figure 69. Temperature Variation vs. RF Input Power at 1900 MHz
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Layout Recommendations
As with any other RF device, careful attention must be paid to the board layout. If the board layout isn’t properly
designed, performance might be less than can be expected for the application.
The LMH2120 is designed to be used in RF applications, having a characteristic impedance of 50Ω. To achieve
this impedance, the input of the LMH2120 needs to be connected via a 50Ω transmission line. Transmission lines
can be created on PCBs using microstrip or (grounded) coplanar waveguide (GCPW) configurations.
In order to minimize injection of RF interference into the LMH2120 through the supply lines, the PCB traces for
V_DD and GND should be minimized for RF signals. This can be done by placing a decoupling capacitor between
the V_DD and GND. It should be placed as close as possible, to the V_DD and GND pins of the LMH2120.
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