U2309B
Test and Principle Application Circuit
Band C
UHF
Band B
VHFH
Band A
VHFL
1n 1n 1n 1n 1n 1n
1n 1n
I/P
15p
I/P
180
I/P
o
Hybrids 0 / 180 degree
with 50 ohms Z(in)
and 100 ohms (2x50) Z(out)
VS
L6
10n
180
o
L.O.
100p
IF : PC 38.9 MHz
SC 33.4 MHz
100p
L.O.
25
21
17
The output–voltage of the
IF is calculated back to the
primary coil of L5
13
1n
2p2
18
2p
BB620
L1
1k
82p
18k
10n
VT
Figure 2.
Test and principle application circuit
18k
8p2
BB515
18k
95 10718
U2309B
Air Coils 0.6 mm
enamelled copper wire
L1
L2
L3
L4
8
3
3
3
turns 3.0 mm dia.
turns 2.5 mm dia. 1p
turns 2.5 mm dia.
turns 2.5 mm dia.
2p7
2p7
2p2
L2
68p
BB619
1p
1p
L3
2k2
1p
1
5
9
15p
L5
IF–Out
O/P
1n
1p
TOKO–Coils
L5 12+2 turns
L6 6+6 turns
VSW
100p
L4
18k
1n
PCB for the R
thJA
-Measurement
Material: 35
m
m one-sided Cu-coated epoxy PCB,
40 mm 40 mm 1.5 mm
R(th) SO28 U2300B
95 10719
Figure 3.
PCB for the R
thJA
-measurement
TELEFUNKEN Semiconductors
Rev. A2, 29-May-96
5 (8)
TEMIC [ TEMIC SEMICONDUCTORS ]
