b) Passband Frequency Response
As shown in Figure 1, the typical gain of the WHM2535-12AE is 14.0 dB across 2.5 to 3.5 GHz. The typical
input and output return losses are 17 dB and 22 dB across the frequency of 2.5 to 3.5 GHz, respectively.
Figure 2 shows the measured P1dB and IP3 of the WHM2535-12AE. The typical P1dB and IP3 are 14 dBm and
31 dBm in the frequency range of 2.5 to 3.5 GHz, respectively.
Figure 3 illustrates the measured noise figure performance at full temperature. The measured results include
the test fixture loss of approximately 0.10 dB. The noise figure is 1.0 dB (including 0.10 dB test fixture loss) across the
frequency range of 2.5 to 3.5 GHz at room temperature. At 85 0C, WHM2535-12AE only has 0.30 dB noise increases.
At –40 0C, WHM2535-12AE offers approximately 0.25 dB less noise figure than that at room temperature.
Figure 4 demonstrates the stability factor k of the amplifier.
Figure 5 is the block diagram of internal circuit of WHM2535-12AE. It is a one-stage amplifier with the DC
block capacitors at the input and output RF ports. All the RF matching networks, DC bias circuitries, and temperature
compensation circuits are integrated in.
Figure 6 demonstrates the application schematic diagram of WHM2535-12AE. It requires the external
decoupling capacitors C1 of 0.01 uF to build a LNA with WHM2535-12AE. C1 is to be as close to Pin 2 as possible.
This capacitor eliminates the parasitic. The +5V DC is applied at Pin 2. No DC block capacitor is required for both
input and output RF ports. The NC pins connected to ground are recommended. For +5V line trace length being longer
than 6 inch without a decoupling capacitor, an additional 0.01 ~ 0.1 uF de-coupling capacitor with minimum rating
voltage of 10V may be needed across the +5V line to ground. The capacitor must be rated in the temperature range of -
40 0C to 85 0C to ensure the entire circuit working in the specified temperature range.
Figure 7 shows the mechanical outline and recommended motherboard layout of WHM2535-12AE. Plenty
of ground vias on the motherboard are essential for the RF grounding. The width of the 50-Ohm lines at the input and
output RF ports may be different for different property of the substrate.
WHM2535-12AE Perform ance @ 25 C
20 S11 S21 S22
WHM2535-12AE IP3 and P1dB
IP3 (dBm )
20 P1dB (dBm )
0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
FIG. 1 Typical small signal performance.
FIG. 2 Typical P1dB and IP3 at room temperature.
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