RF2609
Application Schematic
Measurement
Reference Plane
ZS=1 kΩ
10 nF
3.3 k
Ω
IN+
IN-
GAIN
1
16
15
14
13
12
11
10
9
GAIN
CONTROL
10 nF
2
10 nF
ZIN=1 k
Ω
3
4
5
6
7
8
10 nF
VCC
ZLOAD=1 k
Ω
C1
L1
L1
C2
C2
CDMA Filter
OUT+
OUT-
R2:
Ω
1 k
ZOUT=1 k
Ω
C1
ZLOAD,EFF=500
Ω. L1 and C2
Ω
VCC
Measurement
Reference Plane
R2 sets the balanced output impedance to 1 k
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
10 nF
matching network if the load impedance is not 1kΩ.
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 kΩ.
10
10-12
Rev B3 000822
RFMD [ RF MICRO DEVICES ]
