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10-42
RF2629
Rev B4 010720
10
Application Schematic
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
1
2
3
4
8
7
6
5
GAIN
CONTROL
10 nF
10 nF
IN+
IN-
Measurement
Reference Plane
Z
IN=1 kΩ
Z
S=1 kΩ
R2:
1k
Ω
C2
C2
L1
C1
L1
C1
V
CC
10 nF
V
CC
CDMA Filter
OUT+
OUT-
Z
OUT=1 kΩ
Z
LOAD=1 kΩ
Z
LOAD,EFF=500 Ω
Measurement
Reference Plane
10 nF
3.3 k
Ω
GAIN
R2 sets the balanced output impedance to 1 k
Ω. L1 and C2
serve dual purposes. L1 serves as an output bias choke, and C2
serves as a series DC block. In addition, the values of L1 and
C2 may be chosen to form an impedance matching network if
the load impedance is not 1 k
Ω. Otherwise, the values of L1 and
C1 are chosen to form a parallel-resonant tank circuit at the IF
when the IF filter's input impedance is 1 k
Ω.
GAIN
CONTROL
C8
33 pF
L3
100nH
L4
100nH
C6
10 nF
C7
10 nF
R1
3.3 k
Ω
T1
C3
5pF
C1
10 nF
C4
5pF
C2
10 nF
L1
270 nH
L2
270 nH
1
2
3
4
8
7
6
5
T2
C5
1nF
50
Ω µ strip
J2
SMA
OUT
50
Ω µ strip
J1
SMA
CDMA
1
2
3
P1-1
P1-3
VCC
GND
P1
GC
GC
VCC
2629400, Rev A
VCC
C10
10 nF
R2
510
Ω
R3
510
Ω
1
1
C11
22 pF
C12
22 pF
C9
33 pF
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