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RF2619
Rev B5 010720
10
Application Schematic
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
10 nF
10 nF
R2:
1k
Ω
C2
C2
L1
C1
L1
C1
V
CC
10 nF
V
CC
CDMA Filter
OUT+
OUT-
IN+
IN-
Measurement
Reference Plane
Z
IN=1 kΩ
Z
S=1 kΩ
Z
OUT=1 kΩ
Z
LOAD=1 kΩ
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 1k
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.
Z
LOAD,EFF=500 Ω
Measurement
Reference Plane
10 nF
10 nF
3.3 k
Ω
GAIN
GAIN
CONTROL
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