Title :
A CMOS ADSL codec for central office applications
Author :
Siniscalchi, Patrick P. ; Pitz, Jeanne K. ; Hester, Richard K. ; DeSoto, Stewart ; Wang, Minsheng ; Sridharan, Sucheedran ; Halbach, Robert ; Richardson, Donald ; Bright, William ; Sarraj, Maher ; Hellums, James ; Betty, Christopher ; Westphal, Glenn
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
Abstract :
A CMOS central office codec that supports Full Rate and G.Lite ADSL applications 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. The receive channel contains -17.5 to 33.5 dB of programmable gain, a 138 kHz analog low-pass filter, a 14 bit, 2.208 MSample/s pipeline ADC and a digital low-pass filter. The IC occupies 55.2 mm2 and dissipates 450 mW from a 3.3 V supply
Keywords :
CMOS digital integrated circuits; codecs; digital filters; digital subscriber lines; digital-analogue conversion; pipeline processing; -17.5 to 33.5 dB; 1.104 MHz; 138 kHz; 14 bit; 3.3 V; 450 mW; ADSL codec; CMOS; Full Rate; G.Lite; application-dependent digital filters; central office applications; current steering DAC; digital low-pass filter; low-pass filter; pipeline ADC; programmable attenuator; receive channel; transmit channel; Central office; Codecs; Digital filters; Echo cancellers; Frequency division multiplexing; Low pass filters; Modems; Signal to noise ratio; Switches; Telephony;
Conference_Titel :
Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5809-0
DOI :
10.1109/CICC.2000.852672
