TITLE:
A New Fully Differential Adaptive CMOS Line Driver Using Fuzzy Controller Suitable for ADSL Modems
AUTHORS:
Ali Dadashi, Yngvar Berg, Omid Mirmotahari
KEYWORDS:
Fuzzy Logic Controller (FLC), ADSL Modem, Adaptive Line Driver, Folded Cascode Power Supply Noise, Class A/B
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.8,
June
8,
2016
ABSTRACT: In this paper, a new
principle for an adaptive line driver using Fuzzy logic is presented. This type
of line driver can adapt its output impedance and gain, automatically to the
applied load using a fuzzy logic controller (FLC). This results in
automatically corrected output impedance for different cables with
terminations. Also, the line driver output impedance and gain become
insensitive to process and line variations. As an example, a line driver for
ADSL application has been designed. The circuit operates from a 3.3 v in a 0.35
um standard CMOS technology. The power consumption of FLC is about 1 mW. The
circuit dissipates 106 mW and exhibits a -62 dB THD for a 3.2-Vpp signal at 5
MHz across a 75 ohms Load. It has a relatively high -3 dB bandwidth (240 MHz)
with good phase margin of about 67 degrees in a 10 pF load capacitor.