A 4 channel analog front end for central office ADSL modems

Author

Kenney, John ; Sabouri, Faramarz ; Leung, Vincent ; Guido, John ; Zimany, Ed ; Agrillo, Anthony ; Trackim, Joseph ; Khoury, John ; Shariatdoust, Reza

Author_Institution

NJ Design Center, Analog Devices Inc., Somerset, NJ, USA

fYear

2000

fDate

2000

Firstpage

307

Lastpage

310

Abstract

This chip integrates a 4 channel analog front-end for central office ADSL modems. The receive path has a programmable gain amplifier (PGA) with 30 dB of range followed by a fourth-order 2-bit sigma-delta modulator clocking at 35 MHz. The transmit path uses a 14-bit current steering D/A converter followed by a fourth-order low-pass filter. The device is implemented in 0.35 μm CMOS and consumes less than 160 mW per channel. It is packaged in a 100 pin MQFP package

Keywords

CMOS analogue integrated circuits; application specific integrated circuits; digital subscriber lines; digital-analogue conversion; modems; sigma-delta modulation; 0.35 micron; 14 bit; 160 mW; 35 MHz; ASIC; CMOS IC; D/A converter; MQFP package; asymmetric DSL; central office ADSL modems; current steering DAC; four-channel analog front end; fourth-order low-pass filter; fourth-order sigma-delta modulator; programmable gain amplifier; Bandwidth; Capacitance; Capacitors; Central office; Delta-sigma modulation; Electronics packaging; Gain; Modems; Modulation coding; Pins;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000

Conference_Location

Orlando, FL

Print_ISBN

0-7803-5809-0

Type

conf

DOI

10.1109/CICC.2000.852673

Filename

852673