A CMOS ADSL codec for central office applications

Author

Siniscalchi, Patrick P. ; Pitz, Jeanne K. ; Hester, Richard K. ; DeSoto, Stewart M. ; Wang, Minsheng ; Sridharan, Sucheendran ; Halbach, Robert L. ; Richardson, Donald ; Bright, William ; Sarraj, Maher M. ; Hellums, James R. ; Betty, Christopher L. ; West

Author_Institution

Texas Instrum. Inc., Dallas, TX, USA

Volume

36

Issue

3

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

356

Lastpage

365

Abstract

A CMOS central office codec that supports Full Rate and G.Lite asymmetric digital subscriber line (ADSL) transmission is described. The transmit channel consists of application-dependent digital filters, a 14-bit, 8.832-MSample/s current steering DAC, a 1.104-MHz analog filter, and a programmable attenuator. Due to extensive on-chip digital signal processing, the codec complies with the ADSL transmit power spectral density standards without external filtering. The receive channel contains -17.5 to 33.5 dB of programmable gain staggered strategically across three stages, a 138-kHz analog low-pass filter, a 14-bit, 2.208-MSample/s pipeline ADC, and a digital 138-kHz low-pass filter. The receive channel has a wide input range that can accommodate large line voltages present at the line hybrid circuit. The IC occupies 55.2 mm² and dissipates 450 mW from a 3.3-V supply

Keywords

CMOS integrated circuits; codecs; digital subscriber lines; low-power electronics; -17.5 to 33.5 dB; 1.104 MHz; 138 kHz; 14 bit; 3.3 V; 450 mW; CMOS ASDL codec; Full Rate transmission; G.Lite transmission; analog filter; analog low-pass filter; asymmetric digital subscriber line; broadband communication; central office; current steering DAC; digital filter; digital low-pass filter; hybrid circuit; low-voltage IC; on-chip digital signal processing; pipeline ADC; power spectral density; programmable attenuator; programmable gain; receive channel; transmit channel; Attenuators; Central office; Code standards; Codecs; DSL; Digital filters; Digital signal processing; Filtering; Gain; Low pass filters;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.910474

Filename

910474