13 / 20 page
2-13
RF2938
Rev A8 010418
11
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
Σ
Baseband Amp
Active Selectable
LPF (f
c=1 MHz to 40 MHz)
0-30 dB Gain
Active Selectable
LPF (f
c=1 MHz to 40 MHz)
I
Q
I
Q
+45
°
-45°
TX_EN
15 dB
15 dB
Gain Range
RX_EN
15 dB
-15 dB to
35 dB Gain
IF Amp
Β 2
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
48
45
46
47
44
43
42
41
40
39
38
37
13
16
15
14
17
18
19
20
21
22
23
24
C13
100 pF
R5
10
Ω
VCC
C16
22 nF
C7
100 pF
L6
27 nH
C25
1pF
50
Ωµstrip
J3
IF LO
C21
22 nF
VCC
GC TX
C3
100 pF
L9
68 nH
C36
2pF
50
Ωµstrip
J2
TX IF IN
L2
150 nH
50
Ωµstrip
C4
100 pF
J1
RX IF IN
PD
VCC
TX EN
RX EN
C26
12 pF
L1
2.7 nH
VCC
R3*
0
Ω
50
Ωµstrip
R10*
0
Ω
C23
22 nF
50
Ωµstrip
J4
PA OUT
C24
22 nF
VCC
C27
2pF
50
Ωµstrip
J5
PA IN
VCC
C22
22 nF
C28
22 pF
L3
3.9 nH
C29
3pF
50
Ωµstrip
J6
RF LO
R8
1k
Ω
L7
220 nH
C31
3pF
C32
3pF
L8
39 nH
C34
22 nF
VCC
C38*
5pF
C33
5pF
50
Ωµstrip
J8
IF OUT
SAWTEK
855392
FL1*
50
Ωµstrip
L4
3.9 nH
C25
22 nF
C30
22 pF
50
Ωµstrip
J7
RFOUT
C1
10 nF
C2
10 nF
C5
0.1 uF
50
Ωµstrip
J9
IIN
C6
0.1 uF
50
Ωµstrip
J10
QIN
VCC
C20
22 nF
50
Ωµstrip
J11
IOUT
50
Ωµstrip
J14
Q DATA
50
Ωµstrip
J13
QOUT
50
Ωµstrip
J12
IDATA
C17
8pF
50
Ωµstrip
J15
RSSI
C18
22 nF
C19
22 nF
C11
10 nF
C10
10 nF
R4
10 k
Ω
C15
100 pF
R7
10
Ω
C14
100 pF
R6
0
Ω
VCC
VGC
NOTES:
1) R4 is used to set the bandwidth of the GMC Filters.
2) Pins 14 through 22 contain 2.4 GHz signals. Place tuning/bypass components
as close as possible. Make all lines on these pins 50
Ω.
3) For normal operation, move C33 to C38 and install all components with an
asterisk.
*Do not populate.
P1
1
2
3
CON3
P1-3
GC TX
GND
VCC
P1-1
C9
10 nF
C12
4.7 uF
+
P2
1
2
3
CON3
P2-3
RX EN
GND
P2-1
TX EN
P3
1
2
3
CON3
P3-3
VGC
GND
P3-1
PD
2938400, Rev
-
R1
270 k
Ω
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