參數(shù)資料
型號(hào)： RF2637PCBA
廠商： RF Micro Devices, Inc.
英文描述： RECEIVE AGC AMPLIFIER
中文描述： 接收AGC放大器
文件頁(yè)數(shù)： 4/8頁(yè)
文件大小： 1021K
代理商： RF2637PCBA
10-44
RF2637
Rev A3 040511
Application Schematic
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
1
2
3
4
8
7
6
5
GAIN
CONTROL
R1:
1 k
CDMA-
CDMA+
CDMA IF Filter
Z
S
=500
Z
IN, EFF
=500
Z
IN
=1 k
Z
S, EFF
=333
Measurement
Reference Plane
L1
L1
V
CC
C2
OUT+
OUT-
V
CC
R2: 500
C1
C1
C2
Measurement
Reference Plane
Z
LOAD
=500
Z
LOAD,EFF
=250
Z
OUT
=500
10 nF
10 nF
R1 sets the CDMA balanced input impedance. The effective input impedance is then 500
.
R2 sets the balanced output impedance to 500
. 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 of the load impedance is not
500
. Otherwise, the values of L1 and C1 are chosen to form a parallel-resonant tank circuit
at the IF when the load impedance is 500
.
GAIN
4.7 k
GAIN
CONTROL
R3
510
C8
15 pF
C9
15 pF
L3
390nH
L4
390nH
C6
10 nF
R2
4.7 k
T1
C3
15 pF
C1
10 nF
C4
15 pF
C2
10 nF
L1
390 nH
L2
390 nH
1
2
3
4
8
7
6
5
T2
C5
1 nF
50
μ
strip
J2
SMA
OUT
50
μ
strip
J1
SMA
CDMA
GC
VCC
2627400A
R1
1 k
VCC
C10
10 nF
C7
10 nF
1
2
3
P1
P1-1
P1-3
VCC
GND
GC
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