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Preliminary
5-81
RF2668
Rev B4 010423
5
Application Schematic
Tri-Mode/Dual-Band Operation
Band Gap
Rel
Bias
Supply
Quad
/2
Σ
48
45
46
47
44
43
42
41
40
39
38
37
13
16
15
14
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
12 nH
0.5 pF
10 nF
10 nF
100 pF
100 pF
1nF
1nF
1nF
1nF
10 nF
MODE CE
AGC
MIX
EN
VCO
EN
PLL
ON
270
Ω
1nF
SET1
SET2
47 k
Ω
10 nF
D1
39 nH
**
39 nH
**
10 nF
3.9 k
Ω
VTUNE
DO
LD
10 nF
36 k
Ω
1nF
220 pF
DO
1nF
1nF
39 k
Ω
10 nF
10 nF
REF
Lock
Detect
/R
/N
Charge
Pump
V
CC
V
CC
V
CC
RF OUT (PCS)
LO2
MIX IN+
V
CC
V
GC
OSIG
ISIG
V
CC
V
CC
OSC REF
2.2 nF
33 pF
8.2 nH
3.9 nH
8nH
4.7 pF
4.7 pF
RF OUT (CELL)
MIX IN-
10 nF
MOD OUT-
MOD OUT+
V
CC
L1*
L2*
*L1 and L2 are the bias
choke inductor.
200
Ω
LO1+
LO1-
**Denotes components not normally populated.
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