SAW Components
Preliminary Data B4918
SAW Components
Low Loss Filter for Mobile Communication
Preliminary Data
Features
IF filter for mobile telephone
Channel selection in CDMA systems
Low insertion attenuation
High rejection
single-ended/single-ended, balanced/single-ended
1)
and
balanced/balanced operation possible
s
Package for
Surface Mounted Technology
(SMT)
s
s
s
s
s
B4918
220,38MHz
Ceramic package
QCC12B
Terminals
s
Ni, gold plated
Dimensions in mm,approx. weight 0,2 g
Pin configuration
10
12
4
6,2
1, 7, 8
3, 9
Input
Input ground or balanced input
Output
Output ground or balanced output
Ground
Case ground
Type
B4918
Ordering code
B39221-B4918-Z910
Marking and Package
according to
C61157-A7-A38
Packing
according to
F61064-V8026-Z000
Electrostatic Sensitive Device
(ESD)
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
Source power
T
T
stg
V
DC
P
s
– 30/+ 85
– 40/+ 85
13
10
˚C
˚C
V
dBm
2
Jan 12, 2000
SAW Components
Low Loss Filter for Mobile Communication
Preliminary Data
Characteristics
Operating temperature range:
Terminating source impedance:
Terminating load impedance:
B4918
220,38 MHz
T
= -30˚C ... 85˚C
Z
S
= 420
Ω
|| 44 nH
Z
L
= 580
Ω
|| 54 nH
min.
Nominal frequency
Insertion attenuation at f
N
(including loss in matching network without loss
in baluns)
Amplitude ripple
(p-p,after gating
2)
)
f
N
–0,30 ...
f
N
+0,30
Phase linearity
(after gating
2)
)
(rms deviation)
f
N
–0,63 ...
f
N
+0,63
Relative attenuation
(relative to
α
fN
)
f
N
–0,63 ...
f
N
+0,63
typ.
220,38
6,0
max.
—
8,0
MHz
dB
f
N
α
fN
—
—
∆α
MHz
—
0,7
1,2
dB
MHz
α
rel
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
—
2,1
3,5
˚
—
60,0
50,0
40,0
39,0
42,0
39,0
39,0
40,0
50,0
60,0
30,0
3,0
66,0
58,0
42,0
42,0
50,0
40,5
40,5
43,0
58,0
70,0
36,0
5,0
—
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
f
N
–150,0
f
N
–40,0
f
N
–20,0
f
N
-1,50
...
...
...
...
f
N
+1,25
f
N
+1,50
f
N
+20,0
f
N
+40,0
...
...
...
...
f
N
–40,0
f
N
–20,0
f
N
–1,50
f
N
-1,25
f
N
–1,25
f
N
+1,25
f
N
+1,50
f
N
+20,0
f
N
+40,0
f
N
+300,0
Reflected wave signal suppression
2)
1)
For
single-ended/balanced operation input and output have to be exchanged, i.e. input at pin 4,
input ground 6 and 2, balanced output between pins 10 and 12 (the filter is reciprocal)
dependence of
f
c
:
2)
Removing trailing end of time domain response for which signal is suppressed more than 30 dB.
3)
Temperature
f
c
(T) =
f
c
(T
0
)(1 +
TC
f
(T –
T
0
)
2
)
3
Jan 12, 2000
SAW Components
Low Loss Filter for Mobile Communication
Preliminary Data
Matching networks to 50
Ω
(element values depend on pcb layout)
B4918
220,38MHz
L
s1
L
p2
L
p3
L
s4
=
=
=
=
82 nH
47 nH
68 nH
82 nH
L
s1
L
p1
C
p1
C
p2
L
p2
L
s2
L
s1
L
p1
C
p1
C
p2
L
p2
L
s2
=
=
=
=
=
=
=
=
=
=
=
=
18 nH
56 nH
N/R
N/R
68 nH
82 nH
18 nH
56 nH
N/R
N/R
68 nH
33 nH
Transfer function
(balanced/single-ended, including loss in balun):
4
Jan 12, 2000
SAW Components
Low Loss Filter for Mobile Communication
Preliminary Data
Transfer function
(passband)
B4918
220,38 MHz
Transfer function
(wideband)
5
Jan 12, 2000
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