rf2619 RF Micro Devices, rf2619 Datasheet - Page 4

• Manufacturer Part Number: rf2619
• Description: 3v Cdma/fm Transmit Agc Amplifier
• Manufacturer: RF Micro Devices

10
10-28
RF2619
IN+
IN-
R2 sets the balanced output impedance to 1 k . 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 .
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
Z
S
=1 k
Z
IN
=1 k
Reference Plane
10 nF
10 nF
Measurement
1
2
3
4
5
6
7
8
Applicat ion Schemat ic
CONTROL
GAIN
Z
LOAD,EFF
=500
16
15
14
13
12
11
10
9
3.3 k
10 nF
10 nF
1 k
C1
C1
10 nF
R2:
GAIN
L1
L1
C2
C2
V
V
CC
Z
CC
OUT
=1 k
CDMA Filter
Reference Plane
Z
Measurement
LOAD
Rev B5 010720
=1 k
OUT+
OUT-