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RF2860
Rev A7 031105
Application Schematic
Single-End 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
C2
(pF)
C3
(pF)
L1
(nH)
L2
(nH)
L7
(nH)
L6
(nH)
R1
(k
Ω)
R2
(k
Ω)
R3
(k
Ω)
US PCS, IF=184MHz
10.0
6.2
150
270
1.2
2.7
9.1
8.2
27.0
Korean PCS, IF=220MHz
12.0
5.1
100
180
1.5
3.3
7.5
8.2
27.0
GPS, IF=184MHz
6.0
3.9
220
270
1.5
4.7
DNI
13.0
27.0
IMT-2000, IF=190MHz
4.0
4.7
100
180
1.5
2.7
DNI
130
27.0
3 pF
R3
15 nH
33 nF
DNI
33 nF
LNA IN
LNA GAIN
ENABLE
TX BUFF ENAB
2.2 nH
LO OUT
V
CC
C2
R1
L1
L2
V
CC
33 nF
C3
CDMA IF+
CDMA IF-
LO IN
RF V
CC
3.9 nH
L6
CDMA
IF Saw
4
59
10
16
15
14
13
11
12
9
10
5
6
7
8
2
1
4
3
L7
1 pF
Note 5
Note 4
30
Ω
V
CC
Note 6
Note 8
R2
Note 9
Note 2
1.3 pF
Note 10
Note 7
Note 14
RF Saw
4
1
6
3
GND
GND
GND
GND
Note 11
33 nF
Note 3
Note 1
Note 12
2 to 10
Ω
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