Avago Technologies MGA-71543 - Manual (Page 2)

2
Description 4 layer Board
Designation B
WCDMA-2100
Part Number Package
U2 or 71 DUT
*
MGA-71543 SOT-343 (SC-70) / Switch LNA
U4 or 03 Switch b/n Gnd resistors FDG6303N Dual N-channel, Digital FET
C12 1.8 pF Size 0402/Output match, DC block
C8 0.033 µµµµ F Size 0402 / Bypass capacitor
C9 5.6 pF Size 0402 / DC block capacitor
C38 Not used
C36, C37, C44 82, 82, 27 pF Size 0402 / Bypass capacitors
C47 0.033 µµµµ F Size 0402 / Bypass capacitor
L5 3.9 nH TOK LL1005 0402/Out match/RF choke,DC feed
L6 4.7 nH TOK LL1005 Size 0402 / input noise matching
L7 1.5 nH TOK LL1005 Size 0402 / input noise matching
L25 Not used For tuning / Not used here
R38 51 Ω Ω Ω Ω
Size 0402
R20 36
Ω
Size 0402 / set Id for 16mA Bias
R21 56 Ω Ω Ω Ω Size 0402 / set Id for 10.5mA Bias
R24, R25 6.2 Ω Ω Ω Ω
R24Drop voltage,R25resistive load
R16,R17 0 Ω Ω Ω Ω Size 0402 (Jumper)
R37 0 Ω Ω Ω Ω 0402 Jumper or replace with a stub
R18,R28 Not Used Used for other current setting
Table 1. Component Values for 2100 MHz amplifier on smaller board
Figure 2. Test board layout
Software
controlling the
switch
Manual switch
control