GS3490
User Guide
Rev.0
PDS-060922
January 2015
4 of 7
Propietary & Confidential
www.semtech.com
2.1.2 GS3490 Cable Equalizer Transmitter IBIS-AMI Model
The GS3490 cable equalizer transmitter IBIS-AMI model consists of three parts: (1) the
Analog Driver IBIS model, (2) the Transmitter AMI model, and (3) the QFN package
model. The block diagram in
Figure 2-4
shows the sequence of the signal flow and the
individual parts of the model.
Figure 2-4: GS3490 Cable Equalizer Transmitter IBIS-AMI Model
The Analog Driver IBIS model receives processed signal information from the
Transmitter AMI model and applies the analog characteristics of the GS3490 cable
equalizer transmit driver. The model is based on a single-ended non-inverting
characterization of the GS3490 cable equalizer transmitter and the EDA platform
develops a differential model from complimentary copies of the single-ended model.
The GS3490 cable equalizer Transmitter AMI model consists of OP_CTL parameter to
control the output driver swing and de-emphasis settings. The possible values for
OP_CTL parameter are listed in
Table 2-1
.
As stated in
Section 2.2.1
, a differential model is developed for the GS3490 cable
equalizer transmitter. Therefore, the GS3490 cable equalizer transmitter QFN package
model is provided as a 4-Port S-parameter file (GS3490_DDO.s4p) in standard
touchstone format from 0GHz to 15GHz with 1501 data points.
Table 2-1: OP_CTL Parameter in Transmitter AMI Model
OP_CTL
Swing
De-emphasis
Mute
0
850mV
ppd
Off
N
1
850mV
ppd
2dB
N
2
850mV
ppd
4dB
N
3
850mV
ppd
6dB
N
4
425mV
ppd
Off
N
5
425mV
ppd
2dB
N
6
425mV
ppd
4dB
N
7
425mV
ppd
6dB
N
8
425mV
ppd
N/A
Y
Analog
Term
QFN Package
(S-parameters)
AMI
To Channel
IBIS-AMI Model
