mga-31189 Avago Technologies, mga-31189 Datasheet - Page 2

• Manufacturer Part Number: mga-31189
• Description: 70 To 500 Mhz Ampliier For If Applications Using The Avago Technologies Mga-31189 Ampliier
• Manufacturer: Avago Technologies

PCB Material and Layer Stack Design
Figures 2 and 3 show the top and bottom views of the
MGA-31189 demonstration circuit printed circuit board
(PCB) with the component placement. The demonstration
board is a three-layer board with a Coplanar Waveguide
with Ground (CPWG) on the topside as RF traces and
a solid metal ground plane on the backside with all RF
traces having a characteristic impedance (Z
each layer, the copper thickness is 0.5 oz. or 0.7 mils. Every
copper layer is separated with a dielectric material, and
the board cross sectional diagram is shown in Figure 4.
Figure 2. Demonstration board – top view
Figure 3. Demonstration board – bottom view
2
IN
SOT-89
REV 3.1
Feb 2009
C6
C1
L3
11X
L1
L2
C3
C4
C5
o
) of 50 :. For
C2
C7
OUT
The first dielectric material is 10-mils Rogers RO4350
with a dielectric constant (H
tric material is for mechanical strength and stability and
uses FR4 with a εr of 4.3. Alternatively, FR-4 or G-10 type
material is a good choice for low cost wireless applications.
For applications where noise figure is critical or for higher
frequency applications, the additional cost of PTFE/glass
dielectric material may be necessary to minimize trans-
mission line loss at the amplifier input.
r
) of 3.48. The second dielec-