TELEFUNKEN Semiconductors
V
S
C
7
10
m
F
C
8
100 nF
R
15
22 k
W
R
14
22 k
W
10
m
F
C
9
C
10
22 pF
R
8
100 k
W
300
Filter
U4313B
TOKO A119ACS-19000Z
(L = 2.2
m
H, C = 100 pF)
56
W
W
R
9
IF input
R
10
C
11
10 nF
Wake up
out
16
C
2
100 nF
8.2 k
W
R
1
15
14
13
12
11
10
9
1.5 nF
100 k
W
C
1
10 nF
30 k
W
R
2
100 k
W
R
6
R
5
1
2
3
4
5
6
7
8
C
4
100 nF
R
12
C
12
10 k
W
R
11
100 k
W
220 nF
R
7
22 k
W
Data filter
output
Wake up
R
3
220 k
W
R13
10 k
W
100 k
W
C
5
220 nF
R
4
C
6
220 nF
Comparator
output
Figure 26. FM test circuit with 2 kHz Bessel low pass data filter
LP-filter output voltage Vs+n/Vn ( dB )
10
0
Output voltage ( V )
–10
–20
–30
–40
–50
–60
–70
0
20
N
S+N
2.5
C
10
= 22 pF
2.0
1.5
1.0
0.5
0
10.3
95 10290
C
10
= 47 pF
95 10291
IF-input level ( d
m
BV )
40
60
80
100
10.5
10.7
10.9
95 10136
C
3
11.1
Frequency ( MHz )
Figure 27. Signal to noise ratio FM; deviation 22.5 kHz
Figure 28. FM-discriminator characteristic
Rev. A1: 23.06.1995
11 (14)
TEMIC [ TEMIC SEMICONDUCTORS ]
