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DATA SHEET ? SKY65048-360LF LOW NOISE AMPLIFIER
8
7
6
μ 1 – 40 o C
μ 1 +25 o C
μ 1 +85 o C
20
19
18
17
5
4
3
2
μ 2 – 40 o C
μ 2 +25 o C
μ 2 +85 o C
16
15
14
13
12
900 MHz +25 o C
880 MHz +25 o C
915 MHz +25 o C
900 MHz +85 o C
880 MHz +85 o C
915 MHz +85 o C
900 MHz –40 o C
880 MHz –40 o C
915 MHz –40 o C
1
11
0
0
2
4
6
8
10
12
14
16
18
10
–20
–15
–10
–5
0
+5
Frequency (GHz)
Figure 27. Stability vs Frequency Over Temperature
Input Power (dBm)
Figure 28. Gain vs Input Power Over Temperature and Frequency
(P IN = –20 dBm)
24
+40
+38
22
20
+36
18
+34
+32
16
+30
+28
880 MHz +25 o C
880 MHz +85 o C
880 MHz –40 o C
900 MHz +25 o C
900 MHz +85 o C
900 MHz –40 o C
915 MHz +25 o C
915 MHz +85 o C
915 MHz –40 o C
14
12
10 Ω
50 Ω
100 Ω
200 Ω
500 Ω
Removed
+26
–20
–18
–16
–14
–12
–10
–8
–6
10
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
Input Power/Tone (dBm)
Figure 29. OIP3 vs Input Power Over Temperature and Frequency
(Tone Spacing = 5 MHz)
Evaluation Board Description
The SKY65048-360LF Evaluation Board is used to test the
performance of the SKY65048-360LF low noise amplifier. An
assembly drawing for the Evaluation Board is shown in Figure 31.
The Evaluation Board schematic diagram is shown in Figure 32.
Tables 5 and 6 provide the Evaluation Board reference circuit Bills
of Materials (BOMs) for the 777 to 798 MHz frequency range and
824 to 849 frequency range, respectively. Table 7 provides the
BOM for the available 880 to 915 MHz test board.
Input and output trace lengths have been minimized to reduce
losses. All surface mount components are 0402-sized to reduce
component parasitics. The use of 0603 or larger components is
not recommended. Component spacing has also been minimized.
The board is provisioned with two RF connectors and a DC
launch. The RF connector and board loss up to component C1 is
approximately 0.05 dB at 900 MHz.
It is very important to place multiple ground vias as close to shunt
components as possible. This ensures proper grounding and
circuit performance.
Frequency (GHz)
Figure 30. Small Signal Gain vs Frequency for Multiple Feedback
Resistor Values
Board material is 10 mil thick VT47 FR4 with 1 oz. copper
cladding. RF input and output traces are 50 Ω .
Evaluation Board Test Procedure
Step 1: Connect RF test equipment to amplifier input/output SMA
connectors.
Step 2: Connect DC ground.
Step 3: Connect VDD to a +5 V supply with a current limit of
100 mA. Verify that the board draws approximately
85 mA.
Step 4: Apply RF signal or noise source and verify performance
detailed in Table 4.
Package Dimensions
The PCB layout footprint for the SKY65048-360LF is shown in
Figure 33. Typical case markings are shown in Figure 34.
Package dimensions for the 8-pin QFN are shown in Figure 35,
and tape and reel dimensions are provided in Figure 36.
Skyworks Solutions, Inc. ? Phone [781] 376-3000 ? Fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com
10
November 12, 2009 ? Skyworks Proprietary Information ? Products and Product Information are Subject to Change Without Notice ? 201101D
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