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8-388
RF2860
Rev A9 050902
Application Schematic
Differential IF Matching
NOTES:
1. This resistor sets the LNA current. Increasing the resistor value lowers the current.
2. This resistor sets the mixer current. Increasing the resistor value lowers the current.
3. This capacitor is used for optimum noise figure and input matching.
4. This inductor is used for optimum input match.
5. This inductor is used for optimum input match and IP3. Low impedance path to ground for optimum IP3.
6. DC-blocking capacitor. Not required with most SAW filters.
7. This inductor is used for LNA output match and as an RF choke.
8. This resistor is used to optimize performance over temperature and bias.
9. This inductor is used to optimize the LNA output match.
10. This inductor/capacitor parallel combination is used for mixer/preamp interstage matching and must be placed
~1.6mm or closer to pin 8.
11. Ground for LNA. Place ground via as close to pin as possible for maximum gain.
12. IF output matching component values are dependent on board layout, IF SAW filter, and the IF frequency selected.
Please contact RFMD application engineering for assistance with IF output matching. See attached Single-Ended
and Differential Tuning procedure.
13. These two values are contingent on type of IF SAW filter used.
14. Depending on SAW Filter used, resistor value will be between 2
Ω to 10Ω.
Application
C1
(pf)
C2
(pf)
C3
(pF)
C4
(pF)
L1
(nH)
L2
(nH)
L3
(nH)
L4
(nH)
L5
(nH)
L6
(nH)
L7
(nH)
R1
(k
Ω)
R2
(k
Ω)
R3
(k
Ω)
US PCS,
IF=184MHz
6.2
2.5
6.2
TBD
33
72
72
TBD
15
2.7
1.2
9.1
8.2
27.0
Korean PCS,
IF=220MHz
5.1
3.0
5.1
TBD
33
50
50
TBD
15
3.3
1.5
7.5
8.2
27.0
GPS,
IF=184MHz
3.9
1.5
3.9
TBD
33
110
110
TBD
18
4.7
1.5
DNI
13.0
27.0
IMT-2000,
IF=190MHz
4.7
1.0
4.7
TBD
33
50
50
TBD
10
2.7
1.5
DNI
13.0
27.0
16
15
14
13
11
12
9
10
5
6
7
8
2
1
4
3
3 pF
R3
L5
33 nF
LNA GAIN
ENABLE
TX BUFF ENAB
C2
L2
L1
DNI
33 nF
LNA IN
2.2 nH
LO OUT
LO IN
RF VCC
3.9 nH
L6
VCC
VCC
FL4
RF Saw
4
1
6
3
GND
GND
GND
GND
L7
1 pF
30
Ω
R2
1.3 pF
R1
Note 6
Note 3
Note 4
Note 8
Note 7
Note 9
Note 14
Note 10
Note
11
Note 2
Note
1
L3
VCC
C3
C1
33 nF
33 nF
VCC
Note 12
L4
C4
FL2
IF Saw
4
59
10
Note 13
2 to 10
Ω
Note 5
IF OUT
33 nF
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