Receive Path Implementation
3-6
3.3
Receive Path Implementation
Test points TP1 through TP4 are located on the EVM to facilitate the addition
of the receive signal path to the signal chain as shown in Figure 3-3. When
implementing the receive path, a hybrid must be used, as ADSL is full duplex.
The hybrid cancels out the TX signal and allows the RX signal from the line to
come through. The THS6132 EVM does not have receive or hybrid circuitry
included. Texas Instruments assumes that the customer has a proprietary
hybrid design, and therefore they would prefer to implement it. The user should
know their nominal line impedance characteristics and thus should be able to
match them better. Texas Instruments does have an EVM that contains a
THS6062 ADSL receiver, and this EVM can be purchased separately to
facilitate construction of a complete ADSL transmit/receive interface.
Figure 3-3. Implementation of the Receive Signal Path
Vin2
8
THS6132
THS6132
15 (23)
2 (4)
12 (20)
R2 = RF
R23=2 RG
R15 = Rs
TP1
C2
R3 = Rp
R6 = Rs
R12 = Rp
C1
TP4
+
-
U1B
11 (18)
3 (5)
R1
Z1
R9
J2
Vin1
+
-
U1A
R11 = RF
Z2
R18
J4
1:n
TP2
TP4
Line =
V Line
Vo1
Vo 2
3
2
+V
-
U2A
THS6062
4
5
6
+
-
U2B
THS6062
R
TP3
2R
2R
1
R
R
RX Vout-
+
R
Vout+
7
Vout-
14 (21)
RX Vout+
0
0
R10
49.9
12.4
1 k
? k
0.1
F
500
? k
100
0
0
R19
49.9
12.4
Note:
Component pin numbers shown are for THS6132RGW while pin numbers in parentheses are for THS6132VFP.
Содержание THS6132EVM
Страница 1: ...THS6132EVM November 2002 High Performance Linear Products User s Guide SLOU154...
Страница 12: ...1 4...
Страница 27: ...4 4 Figure 4 4 Bottom Layer 4 Ground and Signal...