RF2157PCBA View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2157PCBA' PDF : 10 Pages View PDF
RF2157
Application Schematic
Korea - CDMA
RF IN
Matching network for
optimum input return loss
Bypassing for
VREG1 and VREG2
C5
15 pF
C24
4.7 pF
Interstage tuning for centering
frequency response
2
RF Choke - Bias inductor
for the amplifier interstage
TL4
VREG
R12
Jumper
C27
15 pF
1 16 15 14 13
C30
11 pF
C8
10 nF
Bypassing for VCC
R11
Jumper
R1
1 kΩ
2
VMODE
3
12
L2
8.2 nH
11
C13
15 pF
4
10
56789
C6
15 pF
VCC
Bias return
L4
15 nH
Matching network for
optimum load impedance
Board
CDMA (Korea)
Pins 1 and 9 are internally grounded to the die flag.
C30 (pF) C1 (pF)
10
4.7
L1 (nH) C14 (pF)
12
2.2
C1
TL1
4.7 pF
L1
12 nH
TL2
C7
1.5 pF
C14
2.2 pF
C3
15 pF
RF OUT
C4
15 pF
C28
10 nF
* L1 is a High Q inductor (i.e., Coilcraft 0805HQ-series).
**C1 and C14 are High Q capacitors (i.e., Johanson C-series).
Transmission
Line Length
CDMA (Korea)
TL1
30-40 mils
TL2
150 mils
TL3
20-30 mils
TL4
200 mils
Rev A19 010611
2-191
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