Application Circuit Description and Layout
Vdd
C3
C2
IN
C7
CTxx
VCTRL
GND
GND
2.2UF/15V
0805
C12
C10
2.2UF/15V
0805
C11
VSENSE
GND
C3
C2
C1
L1 C8
VDD
OUT
11X
RFin
C7
2.2UF/15V
0805
L1
L3
C9
L2
C4
C5
L4
RFout
AVAGO
TECHNOLOGIES
C6
L3
VSENSE
C9
C8
SOT-89
REV 3.2
Jul 2009
GND
Figure 34. Circuit diagram
Figure 35. Demoboard
Bill of Materials
Description
Circuit
Symbol
C2
C3
C7
C8
C9
L1
L3
For 0.45GHz
(1)
Size
0402
0603
0402
0402
0402
0402
0402
For 0.9GHz
(2)
Manufacturer
Murata
Murata
Murata
Murata
Murata
Coilcraft
Coilcraft
For 1.5GHz
(3)
Manufacturer
Murata
Murata
Murata
Murata
NA
Murata
NA
Value
0.1µF
2.2µF
18pF
82pF
5.6pF
56nH
18nH
Value
0.1µF
2.2µF
100pF
39pF
NA
39nH
NA
Value
0.1µF
2.2µF
100pF
100pF
NA
12nH
NA
GND
VDD
Manufacturer
Murata
Murata
Murata
Murata
NA
Murata
NA
Note: NA – not required in actual PCB design
DC
in
RF
in
Input Matching Circuit
1.
Γ_mag
= 0.303,
Γ_ang
= -163.74°
2.
Γ_mag
= 0.071,
Γ_ang
= -113.02°
3.
Γ_mag
= 0.106,
Γ_ang
= -128.48°
11X
Output Matching Circuit
1.
Γ_mag
= 0.063,
Γ_ang
= 96.75°
2.
Γ_mag
= 0.039,
Γ_ang
= -134.54°
3.
Γ_mag
= 0.062,
Γ_ang
= 128.17°
RF
out
Figure 36. Input and output tuned Gamma location for 450MHz
(1)
, 900MHz
(2)
and 1.5GHz
(3)
MGA-31189 is an input and output prematched component. To bias MGA-31189, a +5V supply (Vdd) is connected to the
output pin thru a RF choke, L1 (which isolates the inband signal from the DC supply). The bypass capacitors, C3 and C2
help to eliminate out of low band frequency signals from the power supply. Blocking capacitors are required for its input
(C7) and output (C8), to isolate the supply voltage from succeeding circuits. To improve on input match at 450MHz, L3
and C9 are added. The L1, together with C8 also act as the output tuning circuitry. The recommended output tuning is
for achieving best OIP3, while meeting typical specifications for other parameters.
10
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
