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RF2637
Rev A5 DS050829
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Application Schematic
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
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2
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8
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6
5
GA IN
CONT ROL
R1 :
1 k
Ω
CD M A -
CD M A +
C
D
M
A
I
F
F
i
l
t
e
r
Z S=5 00 Ω
Z IN , EFF=5 00 Ω
Z IN =1 k Ω
Z S, EFF=3 33 Ω
M e as urem en t
R e fe re nc e P lan e
L1
L1
V CC
C2
OU T +
OU T -
V CC
R2 : 5 0 0
Ω
C1
C1
C2
M e as urem en t
R e fe re nc e P lan e
Z LO AD =5 00 Ω
Z LO AD ,EFF= 250 Ω
Z OU T=5 00 Ω
10 n F
10 nF
R 1 s e ts th e C D M A b a la n c e d in put im p e d a n c e . T h e effe c tiv e in p u t im pe da nc e is th en 50 0
Ω .
R 2 s e ts th e b a la nc ed o u tp ut im pe da nc e to 5 0 0
Ω . L 1 an d C 2 s e rv e du al pu rp os es. L 1 s e rv e s
as an outp u t bia s c h o k e , an d C 2 s e rv e s as a s e rie s D C bloc k . In ad dition , th e v a lu e s o f L 1 an d
C 2 m a y be c h os e n to fo rm an im pe da nc e m a tc h ing n e tw ork o f th e lo a d im p e d a n c e is no t 500
Ω . O th e rw is e , th e v a lu es of L1 a n d C 1 a re c h os en to fo rm a pa ra lle l-re s o na nt ta n k c irc u it a t
th e IF w h e n th e load im pe da nc e is 50 0
Ω .
GA IN
4.7 k
Ω
GAIN
CONTROL
R3
510
Ω
C8
15 pF
C9
15 pF
L3
390nH
L4
390nH
C6
10 nF
R2
4.7 k
Ω
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
Ω μstrip
J2
SMA
OUT
50
Ω μstrip
J1
SMA
CDMA
GC
VCC
2627400A
R1
1 k
Ω
VCC
C10
10 nF
C7
10 nF
1
2
3
P1
P1-1
P1-3
VCC
GND
GC
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