PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 51

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
3.4.3
The SLIC outputs the voice signal to the line (receive direction) and also senses the
voice signal coming from the subscriber. The AC impedance of the SLIC and the load
impedance need to be matched in order to maximize power transfer and minimize two-
wire return loss. The two-wire return loss is a measure of the impedance matching
between a transmission line and the AC termination of DuSLIC.
Impedance matching is done digitally within SLICOFI-2x by providing three impedance
matching feedback loops. The loops feed the transmit signal back to the receive signal
simulating the programmed impedance through the SLIC. When calculating the
feedback filter coefficients, the external resistors between the protection network and
SLIC (
account. The impedance can be programmed to any appropriate real and complex
values shown in the Nyquist diagram
adapted to requirements anywhere in the world without requiring the hardware changes
that are necessary with conventional line card designs.
Figure 24
Data Sheet
Im Z
R
PRE
L
Impedance Matching
=
Nyquist Diagram
R
-200
-400
-600
PROT
0
+
R
STAB
200
, see
400
Figure
Figure
51
600
100,
for Line Impedance
Re Z
Possible Values
24. This means that the device can be
L
Page
800
372) have to be taken into
1000
Functional Description
1200
ezm22019.emf
2000-07-14
1400
DuSLIC